WEBVTT 00:01.600 --> 00:04.966 align:start position:17.5% line:79.33% size:67.5% Right along the border that separates Mexico from 00:05.066 --> 00:10.733 align:start position:10% line:79.33% size:65% Southwestern Arizona, is a land of fire, ash and lava. 00:11.900 --> 00:13.833 align:start position:10% line:84.67% size:80% It's called the Sierra Pinacate. 00:14.800 --> 00:17.666 align:start position:15% line:79.33% size:72.5% For some people, it is a land of brutal heat and pitiless 00:17.766 --> 00:18.633 align:start position:37.5% line:84.67% size:25% isolation. 00:18.733 --> 00:20.333 align:start position:35% line:84.67% size:32.5% This is vast. 00:20.633 --> 00:25.300 align:start position:12.5% line:79.33% size:77.5% For me, and many others, it's a wild land of unparalleled beauty 00:25.400 --> 00:27.500 align:start position:25% line:84.67% size:52.5% inviting exploration. 00:34.800 --> 00:38.100 align:start position:27.5% line:79.33% size:45% Funding for In the Americas with David Yetman 00:38.200 --> 00:40.266 align:start position:32.5% line:79.33% size:37.5% was provided by Agnese Haury 00:40.366 --> 00:44.800 align:start position:50% line:84.67% size:2.5% ♪ 00:45.800 --> 00:49.633 align:start position:17.5% line:79.33% size:67.5% Funding for In the Americas with David Yetman 00:49.800 --> 00:52.300 align:start position:25% line:79.33% size:50% was also provided by the Guilford Fund. 00:52.466 --> 00:59.500 align:start position:50% line:84.67% size:2.5% ♪ 01:01.700 --> 01:11.666 align:start position:50% line:74% size:2.5% ♪ In the Americas with David Yetman theme 01:31.233 --> 01:33.800 align:start position:12.5% line:79.33% size:62.5% In the middle of the 19th century, the United States 01:33.866 --> 01:37.200 align:start position:17.5% line:79.33% size:72.5% purchased from Mexico a large tract of land, called the 01:37.333 --> 01:38.500 align:start position:30% line:84.67% size:42.5% Gadsden purchase. 01:39.200 --> 01:42.966 align:start position:15% line:79.33% size:70% Because the line was changed during the purchase, not 01:43.066 --> 01:47.666 align:start position:12.5% line:79.33% size:77.5% included in it, was the largest volcanic field in any desert in 01:47.800 --> 01:52.000 align:start position:20% line:79.33% size:62.5% North America, the Sierra Pinacate. It's now in Mexico, 01:52.100 --> 01:55.100 align:start position:22.5% line:10% size:57.5% parts of extending even into Arizona. 01:56.900 --> 02:01.333 align:start position:12.5% line:79.33% size:77.5% Not only is it a land of former fire and smoke and explosions, 02:01.733 --> 02:04.900 align:start position:15% line:79.33% size:75% but it has a significant human history as well. 02:05.633 --> 02:08.400 align:start position:22.5% line:79.33% size:57.5% There's nowhere else on earth quite like it. 02:11.000 --> 02:15.400 align:start position:15% line:79.33% size:75% The Pinacate volcanic range is so vast, that it is easily 02:15.500 --> 02:19.366 align:start position:15% line:79.33% size:70% visible from outer space, as a dark spot in a desert of 02:19.533 --> 02:20.800 align:start position:37.5% line:84.67% size:27.5% sand dunes. 02:21.233 --> 02:25.000 align:start position:10% line:79.33% size:80% The black color, is mostly lava, it has poured out of fisher█s 02:25.100 --> 02:29.300 align:start position:20% line:79.33% size:62.5% holes and cones from much of the last 40, 000 years. 02:30.100 --> 02:34.333 align:start position:20% line:79.33% size:67.5% The pockmarks are a mixture of cinder cones, well over 400 02:34.433 --> 02:35.866 align:start position:25% line:84.67% size:52.5% of them, and craters. 02:36.433 --> 02:40.433 align:start position:15% line:79.33% size:72.5% Holes produced by cataclysmic explosions, which number at 02:40.566 --> 02:44.000 align:start position:15% line:79.33% size:70% least eight and are the most dramatic features of the range, 02:44.100 --> 02:46.900 align:start position:12.5% line:79.33% size:60% in fact, of any range in the Americas. 02:48.033 --> 02:51.833 align:start position:20% line:79.33% size:60% The darkness of the lava contrasts, most agreeably, with 02:51.966 --> 02:53.766 align:start position:15% line:84.67% size:70% the light brown of the sand. 02:54.566 --> 02:57.666 align:start position:20% line:79.33% size:60% The largest area of dune fields in the Americas. 02:59.566 --> 03:02.100 align:start position:22.5% line:79.33% size:55% The Sierra Pinacate is not easy to reach. 03:02.766 --> 03:06.300 align:start position:10% line:79.33% size:67.5% The few roads are rough and are controlled by Mexican 03:06.433 --> 03:07.566 align:start position:22.5% line:84.67% size:55% national park service. 03:09.233 --> 03:13.233 align:start position:15% line:79.33% size:70% The east side where visitors must register, has the better 03:13.366 --> 03:17.333 align:start position:15% line:79.33% size:75% roadways, dirt tracks that are graded every once in awhile. 03:20.900 --> 03:24.633 align:start position:15% line:79.33% size:75% It's best to visit this rugged dry range with friends, 03:25.366 --> 03:28.400 align:start position:15% line:79.33% size:72.5% a small group of us will camp in an unimproved campground 03:28.500 --> 03:32.800 align:start position:17.5% line:79.33% size:67.5% in a most unusual location. The middle of a cinder cone. 03:34.400 --> 03:37.466 align:start position:22.5% line:79.33% size:57.5% Included are my Mexican colleague and friend, ecologist 03:37.600 --> 03:42.233 align:start position:12.5% line:79.33% size:77.5% Alberto Búrquez and my brother, geologist Dick Yetman. 03:45.566 --> 03:49.966 align:start position:12.5% line:79.33% size:75% Alberto has a special affinity for the Sierra Pinacate, he was 03:50.066 --> 03:53.000 align:start position:15% line:79.33% size:70% assigned to, selected by the Mexican government in the 03:53.133 --> 03:57.500 align:start position:17.5% line:79.33% size:67.5% early 1990s, to demonstrate the significance of Pinacates 03:58.166 --> 03:59.200 align:start position:22.5% line:84.67% size:55% to the Mexican nation. 04:02.633 --> 04:08.600 align:start position:10% line:79.33% size:80% We're here thirty miles from the nearest reliable source of water 04:09.800 --> 04:10.933 align:start position:45% line:84.67% size:10% hot! 04:11.533 --> 04:13.833 align:start position:15% line:79.33% size:75% If we want to go to the top of that hill, we█re nuts. 04:14.700 --> 04:17.900 align:start position:22.5% line:10% size:57.5% But three-hundred years ago, some intrepid souls did it. 04:18.466 --> 04:24.666 align:start position:17.5% line:10% size:67.5% Well yes. Father Kino was a Jesuit, decided to go on 04:24.766 --> 04:28.800 align:start position:12.5% line:10% size:62.5% top of that hill and look towards the sea to be sure 04:28.900 --> 04:31.500 align:start position:25% line:79.33% size:50% that Baja California was a peninsula. 04:31.666 --> 04:34.500 align:start position:20% line:79.33% size:62.5% Well for sure you can see the sea, and you can see 04:34.633 --> 04:35.800 align:start position:30% line:84.67% size:40% Baja California. 04:36.800 --> 04:39.600 align:start position:15% line:79.33% size:70% And in a very clear day, you might see the mouth of 04:39.766 --> 04:40.700 align:start position:27.5% line:84.67% size:47.5% the Colorado River. 04:42.900 --> 04:44.900 align:start position:17.5% line:79.33% size:65% One of the most incredible things about this place, is that 04:46.300 --> 04:48.600 align:start position:10% line:10% size:80% is the fact that if you come don here, you█re seeing land forms 04:48.700 --> 04:51.100 align:start position:22.5% line:10% size:62.5% you have to go to several different places in the North 04:51.266 --> 04:52.733 align:start position:10% line:84.67% size:65% American continent to see. 04:53.733 --> 04:57.366 align:start position:17.5% line:79.33% size:72.5% There are lava flows that are found here, maybe in Hawaii, 04:57.533 --> 05:00.366 align:start position:17.5% line:79.33% size:70% maybe in a few other places. But here we have all of them. 05:04.200 --> 05:08.966 align:start position:17.5% line:79.33% size:67.5% It can be extended probably to 15-30 thousand years ago 05:09.033 --> 05:12.266 align:start position:12.5% line:79.33% size:77.5% that the last major events took place here. In terms of geology, 05:12.366 --> 05:14.266 align:start position:30% line:84.67% size:40% that is a flash. 05:14.700 --> 05:17.100 align:start position:25% line:79.33% size:52.5% That is very close to where we are now. 05:17.833 --> 05:19.666 align:start position:20% line:79.33% size:62.5% One of the reasons we see things differently here than 05:19.766 --> 05:23.800 align:start position:20% line:79.33% size:60% we do in for example the Northwest, is because the 05:23.900 --> 05:26.400 align:start position:20% line:79.33% size:60% variety of lava here was much more basic. 05:27.033 --> 05:29.700 align:start position:17.5% line:79.33% size:67.5% There was a lower silica in the lava, which meant higher 05:29.800 --> 05:33.666 align:start position:15% line:79.33% size:75% viscosity, flow structures are different and were not getting 05:33.766 --> 05:36.833 align:start position:17.5% line:79.33% size:67.5% the violent explosions that typically we find with for 05:37.000 --> 05:39.266 align:start position:10% line:79.33% size:62.5% example, Mount St. Helens with the top that blew off. 05:39.400 --> 05:41.766 align:start position:17.5% line:79.33% size:72.5% And because there's so little rainfall, we have so little 05:41.866 --> 05:44.733 align:start position:17.5% line:79.33% size:67.5% vegetation and there are so many studies that show the 05:44.800 --> 05:47.766 align:start position:10% line:79.33% size:60% impact vegetation has on erosion, and even with the 05:47.866 --> 05:52.266 align:start position:15% line:79.33% size:70% volcanic rocks like this, we find a lot of fertile soil which 05:52.366 --> 05:55.066 align:start position:12.5% line:79.33% size:77.5% is ripe for vegetation, but the one thing missing here of course 05:55.233 --> 05:58.333 align:start position:15% line:79.33% size:70% is the moisture produced the life-giving force for that 05:58.466 --> 05:59.600 align:start position:37.5% line:84.67% size:27.5% vegetation. 05:59.666 --> 06:02.266 align:start position:25% line:79.33% size:52.5% When one comes to the Pinacate you're going to see 06:02.333 --> 06:06.433 align:start position:12.5% line:79.33% size:77.5% maar craters, which are created when magma comes into contact 06:06.600 --> 06:11.600 align:start position:17.5% line:79.33% size:72.5% with groundwater, and creates a great steam explosion, very 06:11.700 --> 06:16.700 align:start position:12.5% line:79.33% size:77.5% dramatic structures, big round, profound, deep, and we can look 06:16.866 --> 06:20.500 align:start position:20% line:79.33% size:62.5% back at the shield of the Pinacate peak, which is a 06:20.600 --> 06:22.866 align:start position:25% line:79.33% size:50% composite volcano in the shape of a shield. 06:23.666 --> 06:26.766 align:start position:17.5% line:79.33% size:72.5% All around the flanks of this shield volcano, there are over 06:26.866 --> 06:31.033 align:start position:17.5% line:79.33% size:67.5% 400 cinder cones. These are small volcanoes that are a 06:31.133 --> 06:33.766 align:start position:20% line:79.33% size:62.5% one-time thing, they come up and form and then they're 06:33.900 --> 06:35.833 align:start position:17.5% line:79.33% size:67.5% done. It's not like they're going to erupt again. 06:42.833 --> 06:46.500 align:start position:15% line:79.33% size:70% We're on top of a lava ridge here, Richard. Why is it 06:46.666 --> 06:48.100 align:start position:27.5% line:84.67% size:47.5% just one big plain? 06:48.166 --> 06:50.433 align:start position:17.5% line:79.33% size:67.5% That's the neat thing about this type of lava, it's so 06:50.533 --> 06:55.266 align:start position:10% line:79.33% size:80% viscous it█s so thick, that it's not like pancake batter 06:55.366 --> 06:59.166 align:start position:20% line:79.33% size:62.5% exactly, it█s more like a real thick biscuit batter. 06:59.333 --> 07:01.866 align:start position:22.5% line:79.33% size:55% It doesn't flow in all directions; it follows the path 07:02.000 --> 07:05.400 align:start position:15% line:79.33% size:70% of least resistance. So it's coming along and hits 07:05.500 --> 07:07.833 align:start position:17.5% line:79.33% size:67.5% a ridge or something that's already there and goes around it 07:08.366 --> 07:09.633 align:start position:20% line:84.67% size:60% It creates a new valley. 07:10.333 --> 07:13.766 align:start position:10% line:79.33% size:80% Boy, it's all over, valley ridge and none of it is easy 07:13.866 --> 07:15.133 align:start position:37.5% line:84.67% size:27.5% to walk on. 07:15.233 --> 07:18.633 align:start position:15% line:79.33% size:75% No. This particular stuff here you can see its carrying all 07:18.733 --> 07:22.066 align:start position:20% line:79.33% size:60% the debris that has come across on its way down here. 07:22.233 --> 07:25.533 align:start position:17.5% line:79.33% size:72.5% Oh, yeah! It's full of rocks. And the barrel cactus. 07:26.533 --> 07:27.600 align:start position:42.5% line:84.67% size:17.5% Thirsty 07:27.700 --> 07:29.366 align:start position:12.5% line:79.33% size:62.5% They're thirsty. And yet, look how healthy they are. 07:30.033 --> 07:32.966 align:start position:20% line:79.33% size:62.5% They survive, 2 inches of rain a year, maybe 3, 07:33.066 --> 07:34.233 align:start position:22.5% line:84.67% size:55% sometimes none at all. 07:40.766 --> 07:44.600 align:start position:15% line:79.33% size:75% One of the greatest inventions in the last two centuries is a 07:44.766 --> 07:51.466 align:start position:15% line:79.33% size:75% shock pole. These are aluminum aircraft alloy, and you take 07:51.566 --> 07:56.066 align:start position:17.5% line:79.33% size:72.5% them like this and all of the sudden you have a pole, that's 07:56.166 --> 07:58.566 align:start position:15% line:84.67% size:75% perfect for setting up a tent. 07:59.166 --> 08:02.566 align:start position:12.5% line:79.33% size:77.5% Even if there's a thunder storm on its way, which there never is 08:02.666 --> 08:05.966 align:start position:17.5% line:79.33% size:65% in the Pinacate, at least, hasn't been for a couple of 08:06.066 --> 08:07.000 align:start position:42.5% line:84.67% size:15% years. 08:08.133 --> 08:09.100 align:start position:20% line:84.67% size:60% You set it up like that. 08:11.500 --> 08:14.166 align:start position:17.5% line:79.33% size:67.5% Now you're ready for desert camping, in this area of red 08:14.266 --> 08:19.866 align:start position:20% line:79.33% size:67.5% cone, we have ash. Volcanic ash, it's a pumice, it is soft 08:19.966 --> 08:23.600 align:start position:10% line:79.33% size:60% and you can see it moves around rather nicely, then 08:23.766 --> 08:26.800 align:start position:10% line:79.33% size:80% if I indent it then I can smooth it back over, and it is the 08:26.900 --> 08:28.200 align:start position:22.5% line:84.67% size:55% perfect place to camp. 08:29.033 --> 08:33.433 align:start position:12.5% line:79.33% size:77.5% Ash invites you to sleep, lulls you to sleep by its softnes. 08:34.333 --> 08:38.433 align:start position:15% line:79.33% size:70% It█s not like anything like, its explosive volcanic ash. 08:47.366 --> 08:50.033 align:start position:17.5% line:79.33% size:72.5% This is red-cone, remnants of a cinder cone and in the 08:50.166 --> 08:53.233 align:start position:17.5% line:79.33% size:72.5% Pinacates it's where the road from the east ends and Father 08:53.300 --> 08:56.133 align:start position:17.5% line:79.33% size:72.5% Kino decided to walk the rest of the way after the top. 08:56.466 --> 09:00.300 align:start position:15% line:79.33% size:75% It's red, because of the weird iron composition of the volcanic 09:00.400 --> 09:04.133 align:start position:22.5% line:79.33% size:60% ash that came out of the volcano and some of the lava. 09:04.633 --> 09:07.700 align:start position:17.5% line:79.33% size:72.5% In every different lava flow, the composition is different, 09:07.800 --> 09:11.800 align:start position:20% line:79.33% size:62.5% different chemistry means different color. Red cone is 09:11.933 --> 09:14.633 align:start position:15% line:79.33% size:70% known throughout the region, as the one place where its, 09:14.733 --> 09:16.366 align:start position:37.5% line:84.67% size:25% sharp red. 09:19.266 --> 09:24.000 align:start position:17.5% line:79.33% size:67.5% I was able to come here, at the end of 1990, so that was 09:24.100 --> 09:29.566 align:start position:17.5% line:79.33% size:70% my first time here and since then, I was just captivated by 09:29.666 --> 09:33.400 align:start position:17.5% line:79.33% size:67.5% the landscape, it's unique, it's magnetic. As it happens to 09:33.533 --> 09:36.933 align:start position:17.5% line:79.33% size:67.5% all the travelers that come here, this place has 09:37.033 --> 09:42.600 align:start position:17.5% line:79.33% size:67.5% extraordinary magic, it's a magnet for explorers. 09:44.033 --> 09:47.566 align:start position:17.5% line:79.33% size:72.5% It's a magnet for writers and for people looking for the 09:47.700 --> 09:51.933 align:start position:15% line:79.33% size:75% aesthetics of the environment. I happen to be in an 09:52.000 --> 09:56.500 align:start position:15% line:79.33% size:70% extraordinary time, in which the United States and Mexico 09:56.600 --> 10:00.433 align:start position:20% line:79.33% size:62.5% wanted to create reserves along the border. And the 10:00.566 --> 10:05.100 align:start position:15% line:79.33% size:75% Pinacate and the Gran Desierto reserves were really important 10:05.233 --> 10:06.333 align:start position:27.5% line:84.67% size:47.5% for both countries. 10:09.200 --> 10:11.666 align:start position:12.5% line:84.67% size:77.5% This crater is 244 meters deep. 10:11.833 --> 10:13.966 align:start position:12.5% line:84.67% size:77.5% So, that's about 800 feet deep. 10:14.100 --> 10:15.000 align:start position:27.5% line:84.67% size:45% Yes, more or less. 10:15.166 --> 10:17.100 align:start position:22.5% line:84.67% size:55% And about a mile wide. 10:18.133 --> 10:19.700 align:start position:25% line:84.67% size:52.5% That█s a mile across? 10:19.800 --> 10:25.600 align:start position:20% line:79.33% size:67.5% Every decade or so, there's a pond down there that quickly 10:25.766 --> 10:27.000 align:start position:37.5% line:84.67% size:27.5% disappears. 10:27.100 --> 10:30.666 align:start position:20% line:79.33% size:67.5% Geologists found there is a layer of travertine, somewhere 10:30.800 --> 10:35.066 align:start position:25% line:79.33% size:52.5% there, that indicates the presence of the lake 10:35.166 --> 10:36.300 align:start position:37.5% line:84.67% size:37.5% Of a deep lake. 10:36.466 --> 10:37.100 align:start position:10% line:79.33% size:60% Lake that probably was a hundred, hundred and fifty 10:39.700 --> 10:45.633 align:start position:10% line:79.33% size:80% feet deep, that was full of freh water and probably many of 10:45.733 --> 10:49.233 align:start position:27.5% line:79.33% size:47.5% the local fauna and migrating birds took advantage. 10:49.366 --> 10:50.766 align:start position:22.5% line:84.67% size:55% So, it was bird oasis. 10:50.933 --> 10:52.633 align:start position:30% line:84.67% size:42.5% 17,000 years ago. 10:54.100 --> 10:58.400 align:start position:12.5% line:79.33% size:77.5% The great appeal of El Pinacate and Gran Desierto de altar is 10:58.500 --> 11:01.466 align:start position:22.5% line:79.33% size:62.5% that there are many, many geomorphic features; features 11:01.566 --> 11:05.033 align:start position:17.5% line:79.33% size:65% that are associated to the geography and the morphology 11:05.166 --> 11:09.533 align:start position:20% line:79.33% size:62.5% of the land. So, you have craters, you have cinder cones, 11:09.633 --> 11:14.466 align:start position:17.5% line:79.33% size:67.5% you have granite mountains, you have great valleys and 11:14.566 --> 11:19.933 align:start position:20% line:79.33% size:62.5% arroyos, you have gallery forests in the desert. And then 11:20.066 --> 11:25.133 align:start position:17.5% line:79.33% size:70% if you go west, you find the great sea of dunes, that have 11:25.266 --> 11:29.333 align:start position:20% line:79.33% size:62.5% the great star dunes, and then the most isolated of 11:29.433 --> 11:32.500 align:start position:17.5% line:79.33% size:52.5% the drylands of North America, Sierra el Rosario. 11:36.433 --> 11:41.033 align:start position:10% line:79.33% size:80% They call this the tecolote flow it's quite a steep little climb. 11:41.200 --> 11:45.366 align:start position:17.5% line:79.33% size:65% I don't know why tecolote, that means owls in Spanish? 11:45.500 --> 11:46.333 align:start position:22.5% line:79.33% size:57.5% How did that get in the conversation? 11:46.466 --> 11:47.366 align:start position:40% line:84.67% size:22.5% Beats me. 11:47.466 --> 11:48.500 align:start position:25% line:79.33% size:50% What do owls have to do with lava? 11:48.633 --> 11:53.766 align:start position:20% line:79.33% size:62.5% But this is vast. It goes on and on, and on. 11:55.066 --> 11:56.500 align:start position:20% line:84.67% size:62.5% Man, this ins incredible. 11:57.233 --> 12:01.100 align:start position:20% line:79.33% size:62.5% Tell me, that is, that is a raft, right? 12:01.900 --> 12:05.100 align:start position:17.5% line:79.33% size:72.5% It looks like it's a piece of the crater from way over 12:05.233 --> 12:09.100 align:start position:22.5% line:79.33% size:57.5% there, that got rafted, carried out by the lava, 12:09.233 --> 12:10.266 align:start position:27.5% line:84.67% size:45% all this distance. 12:10.333 --> 12:12.300 align:start position:27.5% line:79.33% size:45% Heck, what's that? 3/4 of a mile, at least. 12:12.433 --> 12:15.066 align:start position:17.5% line:79.33% size:67.5% Maybe a mile. And it's just sitting on top of out here, 12:15.166 --> 12:18.633 align:start position:12.5% line:79.33% size:77.5% I feel like there█s a bulldozer underground, just pushing 12:18.733 --> 12:19.666 align:start position:30% line:84.67% size:40% this mass along. 12:21.800 --> 12:25.366 align:start position:17.5% line:79.33% size:72.5% These big chunks are actually pieces of the original lava 12:25.500 --> 12:28.233 align:start position:15% line:79.33% size:70% flow probably that came from the top and broke up as the 12:28.333 --> 12:31.466 align:start position:15% line:79.33% size:70% energy kept pushing. But the cinders down here on the ground, 12:33.066 --> 12:36.366 align:start position:10% line:79.33% size:65% this is actually, probably chunks of cinder from the 12:36.466 --> 12:39.966 align:start position:20% line:79.33% size:60% crater, because it was a cinder cone. So, this stuff gets 12:40.066 --> 12:43.500 align:start position:17.5% line:79.33% size:70% locked in the lava, maybe in big blobs and gets more easily 12:43.666 --> 12:44.566 align:start position:35% line:84.67% size:30% broken down. 12:49.000 --> 12:52.866 align:start position:10% line:79.33% size:57.5% Down here, we have very fine clay soils. That will 12:53.033 --> 12:56.000 align:start position:17.5% line:79.33% size:55% support as we call the creosote bush. 12:56.933 --> 13:02.366 align:start position:17.5% line:79.33% size:67.5% Well as we progress towards the crater, then we see the 13:02.466 --> 13:05.533 align:start position:22.5% line:79.33% size:57.5% brittle bush that grows in coarser soils. 13:06.800 --> 13:11.633 align:start position:15% line:79.33% size:75% When I look at Cerro Colorado, first off the color is different 13:11.800 --> 13:15.166 align:start position:10% line:79.33% size:70% you don't see the dark lavas all around 13:15.866 --> 13:18.833 align:start position:20% line:79.33% size:62.5% What geologists said that there were, sort of little lakes 13:19.000 --> 13:23.900 align:start position:17.5% line:79.33% size:65% around, which, one remains close by. So, when the volcanic 13:24.033 --> 13:27.833 align:start position:10% line:79.33% size:65% activity occurred, it went through layers of mud. 13:27.966 --> 13:30.466 align:start position:15% line:79.33% size:70% That's we see mud everywhere here. That's why. 13:30.566 --> 13:33.966 align:start position:10% line:79.33% size:80% Yes, yes, yes just lift the mud, and there were explosions and 13:34.100 --> 13:37.033 align:start position:12.5% line:79.33% size:77.5% there was hydrothermal activity and there were lots of water 13:37.166 --> 13:42.033 align:start position:17.5% line:79.33% size:65% and steam, magma contacted the mud and the water table, 13:42.166 --> 13:45.833 align:start position:17.5% line:79.33% size:52.5% and then there was an explosion and another, and 13:45.933 --> 13:47.666 align:start position:20% line:79.33% size:60% another. And that can be seen in the walls. 13:48.933 --> 13:52.600 align:start position:20% line:79.33% size:65% Cerro Colorado is isolated from the rest of the east side 13:52.733 --> 13:57.533 align:start position:17.5% line:79.33% size:67.5% of the range, no roads laid across, we must return to 13:57.633 --> 14:00.700 align:start position:25% line:79.33% size:57.5% Mexico Highway 2, which parallels the border with the 14:00.833 --> 14:05.033 align:start position:17.5% line:79.33% size:67.5% United States,for more than 20 miles,to reach the west side. 14:09.066 --> 14:13.766 align:start position:22.5% line:79.33% size:57.5% The west side roads are unimproved dirt tracks,sometimes 14:13.866 --> 14:18.100 align:start position:22.5% line:79.33% size:60% obscured by blowing sand or washed out by an occasional 14:18.233 --> 14:21.000 align:start position:17.5% line:79.33% size:72.5% flash flood. Weeks may go by, without a single vehicle 14:21.133 --> 14:23.600 align:start position:30% line:84.67% size:40% passing through. 14:25.066 --> 14:29.733 align:start position:22.5% line:79.33% size:57.5% Back in the late 1960s, NASA was trying to train 14:29.866 --> 14:34.666 align:start position:15% line:79.33% size:75% astronauts to ride in vehicles on the moon. And now we 14:34.800 --> 14:37.833 align:start position:20% line:79.33% size:60% know that the astronauts practicing here left some 14:38.000 --> 14:42.800 align:start position:12.5% line:79.33% size:77.5% graffiti, part of a 10,000 year old history of graffiti here. 14:42.933 --> 14:48.666 align:start position:20% line:79.33% size:60% The area here is so well suited to a keep the record, 14:48.800 --> 14:52.900 align:start position:20% line:79.33% size:62.5% that it has endured since the 1970s here, as 14:53.000 --> 14:58.166 align:start position:10% line:79.33% size:57.5% paintings or engravings have endured 10, 000 years 14:58.300 --> 15:00.466 align:start position:22.5% line:84.67% size:57.5% in the Pinacate region. 15:03.400 --> 15:06.933 align:start position:20% line:79.33% size:60% Throughout the Pinacate, everywhere you look the 15:07.100 --> 15:09.800 align:start position:10% line:79.33% size:57.5% rocks become almost the same color, with this kind 15:09.933 --> 15:11.166 align:start position:30% line:84.67% size:42.5% of shiny surface. 15:11.800 --> 15:17.000 align:start position:20% line:79.33% size:67.5% This luster that most rocks of the Pinacate have, because 15:17.100 --> 15:19.533 align:start position:22.5% line:79.33% size:57.5% they have remaining C2, and they have been buried in 15:19.633 --> 15:22.200 align:start position:25% line:79.33% size:52.5% the same position for thousands of years. Nothing 15:22.300 --> 15:26.333 align:start position:25% line:79.33% size:50% else grows, but this microorganism that they deposit 15:26.466 --> 15:29.933 align:start position:22.5% line:79.33% size:55% a layer of minerals on top of the rock. 15:30.700 --> 15:33.566 align:start position:17.5% line:79.33% size:67.5% So, this rock has been here for many thousands of years 15:33.700 --> 15:37.533 align:start position:22.5% line:79.33% size:57.5% and had time to develop the varnish and underneath, 15:37.633 --> 15:41.000 align:start position:17.5% line:79.33% size:72.5% it looks just kind of like an ordinary piece of rock. 15:41.133 --> 15:42.300 align:start position:27.5% line:84.67% size:45% No varnish on top. 15:46.566 --> 15:49.166 align:start position:12.5% line:79.33% size:77.5% This is called El Trébol, which actually in Spanish means 15:49.266 --> 15:54.200 align:start position:10% line:79.33% size:80% clover leaf. It's a maar crater, but what's unique about it is 15:54.300 --> 15:58.533 align:start position:15% line:79.33% size:70% has three loaves, it is said that there is a fourth loave in 15:58.666 --> 16:01.633 align:start position:15% line:79.33% size:70% this one. So, there were, it looks like there were three 16:01.733 --> 16:04.766 align:start position:20% line:79.33% size:60% eruptions, which created this maar. Probably very 16:04.866 --> 16:08.400 align:start position:17.5% line:79.33% size:65% close together. And if you walk the perimeter of this, 16:08.533 --> 16:10.700 align:start position:25% line:79.33% size:52.5% you can see where the fourth one probably was. 16:13.266 --> 16:16.300 align:start position:15% line:79.33% size:70% This place is called Tinajas de los Papagos or Papago 16:16.400 --> 16:20.433 align:start position:17.5% line:79.33% size:72.5% Tanks it is the most reliable and accessible supply of 16:20.533 --> 16:23.566 align:start position:22.5% line:79.33% size:57.5% water, guaranteed water in all of the Pinacate. 16:24.266 --> 16:27.800 align:start position:10% line:79.33% size:65% It has been here and known by indigenous people for 16:27.900 --> 16:30.533 align:start position:17.5% line:79.33% size:67.5% thousands of years and they relied on it as they move 16:30.633 --> 16:33.200 align:start position:10% line:79.33% size:65% back and forth between the Gulf of California and the 16:33.333 --> 16:35.466 align:start position:12.5% line:84.67% size:77.5% North. Primarily bringing salt. 16:35.566 --> 16:40.833 align:start position:17.5% line:79.33% size:67.5% There are clear indications that people have been here 16:40.966 --> 16:45.233 align:start position:15% line:79.33% size:75% before, these are little water holes in the salt and the lava . 16:45.366 --> 16:49.033 align:start position:17.5% line:79.33% size:67.5% And here is a huge one, and it's beautifully round, it could 16:49.200 --> 16:53.333 align:start position:17.5% line:79.33% size:67.5% not be anything but a place where women and maybe some 16:53.400 --> 16:56.900 align:start position:12.5% line:79.33% size:77.5% men sat to grind. What did they grind, Alberto? What did they 16:57.033 --> 16:58.166 align:start position:37.5% line:84.67% size:25% make here? 16:58.300 --> 17:02.966 align:start position:15% line:79.33% size:70% The staple here was mesquite pods, you would have the 17:03.100 --> 17:05.266 align:start position:20% line:79.33% size:62.5% whole pod of the mesquite and you have to grind it, 17:05.400 --> 17:07.966 align:start position:20% line:79.33% size:60% and many other things of course, you can add some 17:08.066 --> 17:09.300 align:start position:15% line:84.67% size:70% tribulus that you collected. 17:11.766 --> 17:17.900 align:start position:10% line:79.33% size:60% Squash, corn. These were the blenders of the time. 17:18.966 --> 17:24.266 align:start position:17.5% line:79.33% size:72.5% The landscape here is sort of bleak, all lava, but you do have 17:24.400 --> 17:26.166 align:start position:15% line:79.33% size:70% the glorious Palo Verde. And when you have to live here, 17:29.866 --> 17:33.933 align:start position:17.5% line:79.33% size:65% The O'odham after whom the Papago Tanks are named, 17:34.066 --> 17:38.266 align:start position:17.5% line:79.33% size:65% base their annual calendar on the reproductive cycle of 17:38.400 --> 17:41.200 align:start position:20% line:79.33% size:65% the saguaro the flowering, the fruiting, they make wine. 17:41.333 --> 17:44.366 align:start position:22.5% line:79.33% size:55% And to find them here, would just be an additional 17:44.500 --> 17:47.533 align:start position:25% line:79.33% size:55% bonus to the water and the saguaros all around here. 17:48.066 --> 17:50.733 align:start position:20% line:79.33% size:62.5% The saguaro is the iconic plant of the Sonoran Desert. 17:50.866 --> 17:54.866 align:start position:20% line:79.33% size:60% It invades, it's present everywhere and the law of 17:55.033 --> 17:56.933 align:start position:20% line:79.33% size:60% the indigenous people of the Sonoran Desert. 17:57.233 --> 18:01.166 align:start position:20% line:79.33% size:60% God the other plant, you can't not notice, is the brittl. 18:01.333 --> 18:03.000 align:start position:22.5% line:84.67% size:55% Brilliant yellow gold. 18:03.333 --> 18:06.366 align:start position:15% line:79.33% size:70% And there's one with the red center that is Encelia farinose. 18:06.500 --> 18:08.733 align:start position:10% line:79.33% size:65% It█s associated with water courses farther the north. 18:13.066 --> 18:17.133 align:start position:20% line:79.33% size:67.5% Among the many craters that Sierra Pinacate holds, Crater 18:17.233 --> 18:20.633 align:start position:22.5% line:79.33% size:62.5% Sykes is my favorite. Not only is it different from the 18:20.766 --> 18:24.600 align:start position:20% line:79.33% size:67.5% other craters, in the sands of, there is a deepest to the 18:24.733 --> 18:28.900 align:start position:17.5% line:79.33% size:65% diameter, but also because it has all sorts beautiful colos 18:29.033 --> 18:30.066 align:start position:35% line:84.67% size:32.5% in its frame. 18:32.333 --> 18:35.133 align:start position:22.5% line:79.33% size:55% At the bottom, what we find is the collapse of the 18:35.233 --> 18:40.133 align:start position:17.5% line:79.33% size:72.5% crater itself, that created a very sandy bottom. In which 18:40.233 --> 18:43.333 align:start position:17.5% line:79.33% size:67.5% there's a small plier. when there are outpours of rain, 18:43.400 --> 18:49.633 align:start position:10% line:79.33% size:80% it causes a little bit of water, as well as Elegante, at sometims 18:49.766 --> 18:54.666 align:start position:20% line:79.33% size:60% Sykes had a lake inside. Sykes is not the only crater 18:54.766 --> 18:58.700 align:start position:17.5% line:79.33% size:72.5% in this small area, there are many others around, McDougal, 18:58.800 --> 19:05.366 align:start position:17.5% line:79.33% size:72.5% Molina, Badillo, and Celaya . And farther south, the crater 19:05.500 --> 19:07.066 align:start position:27.5% line:84.67% size:45% La Luna, the moon. 19:15.133 --> 19:18.166 align:start position:22.5% line:79.33% size:57.5% About 20 miles from the southern foothills of the Sierra 19:18.300 --> 19:22.566 align:start position:15% line:79.33% size:75% Pinacate is the Mexican resort on the gulf of California, 19:22.700 --> 19:26.800 align:start position:20% line:79.33% size:60% called Puerto Peñasco or Rocky Point. Today it█s a 19:26.900 --> 19:32.800 align:start position:20% line:79.33% size:62.5% bustling tourist haven of about 60,000 people, many 19:32.900 --> 19:35.200 align:start position:32.5% line:79.33% size:45% of them Mexican or American tourists. 19:35.933 --> 19:40.966 align:start position:15% line:79.33% size:70% 50 years ago it was a small, quiet, easy going fishing 19:41.100 --> 19:44.333 align:start position:17.5% line:79.33% size:67.5% village of a couple hundred people, with one street. 19:45.533 --> 19:48.866 align:start position:22.5% line:79.33% size:57.5% This new tourist magnet draws its water from the aquifer 19:49.000 --> 19:53.733 align:start position:12.5% line:79.33% size:77.5% underlying the Sierra Pinacate. It's harder to imagine a greater 19:53.833 --> 19:57.400 align:start position:20% line:79.33% size:62.5% contrast than the frantic activity among the thousands 19:57.500 --> 19:59.333 align:start position:17.5% line:79.33% size:72.5% of tourists in Puerto Peñasco and the wild desolation of the 19:59.466 --> 20:04.800 align:start position:30% line:79.33% size:52.5% volcanic range of the Sierra Pinacate. 20:07.800 --> 20:11.300 align:start position:15% line:79.33% size:70% Many people drive south from the states into Rocky Point, 20:11.400 --> 20:15.933 align:start position:12.5% line:79.33% size:77.5% just to have a good time there. Never realizing that they are 20:16.066 --> 20:21.933 align:start position:25% line:79.33% size:57.5% going past this amazing piece of earth, in here. That 20:22.033 --> 20:26.600 align:start position:20% line:79.33% size:62.5% has been decreed as world heritage by Unesco. 20:30.633 --> 20:33.466 align:start position:17.5% line:79.33% size:67.5% The sand dunes here, in the gran desierto, you can see a 20:33.600 --> 20:38.666 align:start position:12.5% line:79.33% size:77.5% classic geological battle going on. The lava flow called the 20:38.800 --> 20:40.133 align:start position:40% line:84.67% size:22.5% Ives flow 20:40.233 --> 20:44.566 align:start position:10% line:79.33% size:80% comes out of the Sierra Pinacate flows down, covering sand as it 20:44.666 --> 20:49.000 align:start position:17.5% line:79.33% size:70% comes, meets the granites of Sierra Blanca, starts going up 20:49.133 --> 20:53.733 align:start position:17.5% line:79.33% size:72.5% the side and continues. After it cools, the winds continue 20:53.833 --> 20:57.300 align:start position:22.5% line:79.33% size:62.5% and bring in the sand and the sand then covers the lava. 20:57.400 --> 21:00.966 align:start position:20% line:79.33% size:62.5% And until a new lava flow comes to cover the sand, 21:01.066 --> 21:05.400 align:start position:20% line:79.33% size:62.5% the battle will go to the victor. In this case the sand. 21:06.900 --> 21:09.366 align:start position:25% line:79.33% size:57.5% So, to have sand dunes, real sand dunes, you have 21:09.466 --> 21:14.500 align:start position:20% line:79.33% size:62.5% to have two things; a lot of wind and a source of sand. 21:15.566 --> 21:16.866 align:start position:22.5% line:84.67% size:55% And here we have both. 21:17.000 --> 21:18.133 align:start position:27.5% line:84.67% size:45% Here we have both. 21:18.200 --> 21:21.433 align:start position:12.5% line:79.33% size:62.5% Strong winds in the upper gulf of California and the 21:21.533 --> 21:26.466 align:start position:17.5% line:79.33% size:72.5% Colorado river carrying Rocky Mountains sand down into the 21:26.600 --> 21:27.933 align:start position:27.5% line:84.67% size:45% mouth of the gulf. 21:28.233 --> 21:30.366 align:start position:12.5% line:79.33% size:62.5% Do you think that perhaps the sand we█re walking on, 21:30.500 --> 21:32.766 align:start position:20% line:79.33% size:60% was once part of what is now Grand Canyon? 21:33.066 --> 21:38.633 align:start position:25% line:79.33% size:57.5% Indeed, by Yuma, it was reckoned that it had a million 21:38.733 --> 21:42.866 align:start position:22.5% line:79.33% size:55% tons of sand that were carried every year. 21:43.000 --> 21:43.933 align:start position:37.5% line:84.67% size:27.5% Every year. 21:46.133 --> 21:48.366 align:start position:22.5% line:79.33% size:55% Have you ever noticed, that climbing up sand 21:48.500 --> 21:49.833 align:start position:30% line:84.67% size:40% dunes is tricky? 21:50.300 --> 21:51.600 align:start position:35% line:84.67% size:30% It's tiring. 21:52.000 --> 21:55.166 align:start position:17.5% line:79.33% size:70% I have to tell you something important, it is a lot easier 21:55.300 --> 21:55.900 align:start position:37.5% line:84.67% size:27.5% going down. 21:56.933 --> 21:57.800 align:start position:35% line:84.67% size:30% I love that. 21:57.933 --> 21:58.666 align:start position:45% line:84.67% size:12.5% Yeah. 21:58.733 --> 22:00.333 align:start position:12.5% line:84.67% size:77.5% As a kid, I enjoyed it so much. 22:00.466 --> 22:02.800 align:start position:27.5% line:79.33% size:47.5% The plants have not stabilized this yet. 22:04.300 --> 22:08.066 align:start position:17.5% line:79.33% size:62.5% But now we come down here and all of the sudden, here 22:08.200 --> 22:12.133 align:start position:15% line:79.33% size:70% are plants. Here's a perfect example of a plant that can 22:12.233 --> 22:14.833 align:start position:25% line:79.33% size:52.5% survive in the dunes. Look at this. 22:16.500 --> 22:22.066 align:start position:12.5% line:79.33% size:77.5% The trunk, originally was about 6 inches in the sand and 22:22.200 --> 22:23.600 align:start position:20% line:84.67% size:60% now it's been excavated. 22:24.100 --> 22:27.766 align:start position:15% line:79.33% size:70% Sometimes you will find only the top of this plant, going 22:27.900 --> 22:32.666 align:start position:17.5% line:79.33% size:67.5% out of the dune and then it deflates and the sand is 22:32.766 --> 22:36.133 align:start position:15% line:79.33% size:70% carried away, and then these roots are exposed. And they 22:36.266 --> 22:37.533 align:start position:32.5% line:84.67% size:35% can go far.... 22:37.666 --> 22:39.500 align:start position:15% line:84.67% size:70% They must be 10 meters down. 22:39.866 --> 22:40.933 align:start position:37.5% line:84.67% size:25% Very long. 22:41.166 --> 22:44.800 align:start position:10% line:79.33% size:60% And the dunes hold water very well, so if they want 22:44.933 --> 22:46.866 align:start position:10% line:79.33% size:65% to have the roots in water they have to go down to 22:47.000 --> 22:48.133 align:start position:35% line:84.67% size:30% where it is. 22:48.200 --> 22:51.000 align:start position:15% line:79.33% size:70% Well, dunes are the subjects of the whim of winds. 22:52.066 --> 22:53.200 align:start position:12.5% line:84.67% size:60% the whim of winds, good. 22:55.866 --> 22:59.233 align:start position:32.5% line:79.33% size:45% We are very lucky, here is a Ajo Lily. 22:59.366 --> 22:59.400 align:start position:27.5% line:79.33% size:45% We are very lucky, Aren't they beautiful?. 23:00.100 --> 23:01.366 align:start position:22.5% line:84.67% size:55% Aren't they beautiful? 23:01.500 --> 23:02.333 align:start position:40% line:84.67% size:22.5% One, one. 23:03.733 --> 23:08.866 align:start position:20% line:79.33% size:60% But in good years, there are thousands, perhaps 23:09.000 --> 23:14.933 align:start position:15% line:79.33% size:70% millions of them. Very tall. Covering the whole desert. 23:15.633 --> 23:19.600 align:start position:17.5% line:79.33% size:67.5% They have a bulb, just like any lily that you plant, right? 23:19.733 --> 23:23.400 align:start position:15% line:79.33% size:70% And they have a storage bulb underneath and they, when 23:23.500 --> 23:26.266 align:start position:17.5% line:79.33% size:72.5% it rains then, they will pick up that moisture and store 23:26.400 --> 23:28.766 align:start position:12.5% line:79.33% size:60% it in that bulb, and get carried away. 23:29.333 --> 23:34.333 align:start position:17.5% line:79.33% size:67.5% Yes, just to survive by the season, and a wait for the 23:34.466 --> 23:37.633 align:start position:10% line:84.67% size:67.5% expected good winter rains. 23:48.333 --> 23:51.366 align:start position:20% line:79.33% size:65% We can still see the faint outline of the city of Puerto 23:51.500 --> 23:55.533 align:start position:22.5% line:79.33% size:62.5% Penasco, the dunes, which I'm standing, seem to present 23:55.600 --> 24:01.466 align:start position:10% line:79.33% size:80% a buffer or barrier or protectie coating for the Pinacate 24:01.566 --> 24:05.666 align:start position:15% line:79.33% size:75% biological reserve. Beyond us, is a wilderness that needs to 24:05.800 --> 24:07.300 align:start position:22.5% line:84.67% size:55% be protected, forever. 24:07.433 --> 24:14.800 align:start position:25% line:84.67% size:2.5% ♪ 24:50.200 --> 24:52.700 align:start position:30% line:79.33% size:42.5% Join us next time in the americas 24:52.833 --> 24:55.833 align:start position:35% line:79.33% size:32.5% with me David Yetman 24:57.300 --> 24:57.333 align:start position:25% line:10% size:52.5% They are producers of oxygen and absorbers of greenhouse gases. 24:58.933 --> 25:00.433 align:start position:25% line:10% size:50% Tropical rainforests are among earth's great drivers of climate. 25:00.566 --> 25:02.466 align:start position:25% line:10% size:52.5% They are producers of oxygen and absorbers of greenhouse gases. 25:02.833 --> 25:06.400 align:start position:22.5% line:10% size:40% Part of expanded researchinto how our planet operates... 25:06.633 --> 25:09.533 align:start position:22.5% line:74% size:57.5% are two different sites dedicated to expanding our understanding... 25:09.666 --> 25:13.300 align:start position:35% line:79.33% size:32.5% of these huge reservoirs of life. 25:13.400 --> 25:16.866 align:start position:20% line:74% size:60% The Biosphere in Arizona and the rain forest of Costa Rica. 25:20.200 --> 25:22.966 align:start position:22.5% line:84.67% size:57.5% I don't have my hat on. 25:23.100 --> 25:25.933 align:start position:10% line:79.33% size:65% It's alright, this is sort of like behind the scenes 25:26.066 --> 25:29.666 align:start position:20% line:79.33% size:60% of what it takes to make good television 25:33.233 --> 25:35.266 align:start position:27.5% line:79.33% size:37.5% Dave is slaving away in the kitchen 25:35.366 --> 25:37.266 align:start position:22.5% line:79.33% size:57.5% He volunteered to bring breakfast 25:37.366 --> 25:38.333 align:start position:17.5% line:79.33% size:52.5% That's because in the morning Dave does something 25:41.033 --> 25:44.333 align:start position:25% line:79.33% size:42.5% Restless activity proves a man -Goethe 25:53.900 --> 25:56.800 align:start position:27.5% line:79.33% size:45% Funding for In the Americas with David Yetman 25:56.933 --> 25:59.533 align:start position:32.5% line:79.33% size:37.5% was provided by Agnese Haury 26:05.566 --> 26:08.366 align:start position:17.5% line:79.33% size:67.5% Funding for In the Americas with David Yetman 26:08.500 --> 26:11.800 align:start position:25% line:79.33% size:50% was also provided by the Guilford Fund. 26:20.800 --> 26:24.433 align:start position:27.5% line:79.33% size:45% Copies of this and other episodes 26:24.566 --> 26:27.400 align:start position:27.5% line:79.33% size:45% of In the Americas with David Yetman 26:27.533 --> 26:29.766 align:start position:27.5% line:79.33% size:45% are available from the Southwest Center 26:29.900 --> 26:32.133 align:start position:35% line:79.33% size:32.5% to order call 1-800-937-8632 26:32.266 --> 26:35.800 align:start position:17.5% line:79.33% size:65% Please mention the episode number and program title 26:36.633 --> 26:39.733 align:start position:32.5% line:79.33% size:42.5% Please be sure to visit us at intheamericas.com 26:39.866 --> 26:42.933 align:start position:22.5% line:84.67% size:57.5% or at intheamericas.org