Music What made this newscast a podcast designed to help you fall asleep? Find a set's newscast.com and to learn more about the newscast plus for ad-free listening and expanded content, Go to snoozecast.com slash plus. This episode is brought to you by the favorite haunts of the Jaguar. Tonight, we'll read from the ninth chapter of British naturalist Charles Darwin's The Voyage of the Beagle, titled Santa Cruz, Patagonia, and the Falkland Islands. The five-year expedition laid the groundwork for Darwin's later theory of evolution by natural selection. In this chapter, Darwin recounts an overland expedition up the Santa Cruz River in southern Patagonia. The landscape is stark and repetitive, with shingle planes, thorny bushes, and a scarcity of birds or waterfowl. Darwin documents fast flows of basaltic lava and enormous erratic boulders, offering early insights into glacial and marine forces that shaped the land. His observations blend physical hardship with scientific wonder, as he marvels at condors circling above the cliffs and theorizes about the slow, ancient processes that carved the Patagonian terrain. If you'd like to start from the beginning, the first episode of this series aired on June 10th, 2024, with subsequent monthly episodes exploring Darwin's Journey in detail. Let's get cozy. Close your eyes. Relax your body into the softness of your bed. Now, take a few deep breaths. April 13, 1834. The beagle anchored within the mouth of the Santa Cruz. This river is situated about 60 miles south of Port Saint Julian. During the last voyage, Captain Stokes proceeded 30 miles up it, but then from the want of provisions to return. Accepting what was discovered at that time, scarcely anything was known about this large river. Captain Fitzroy now determined to follow its course as far as time would allow. On the 18th three whale boats started, carrying three weeks' provisions, and the party consisted of 25 souls. With a strong flood tide and a fine day we made a good run, soon drank some of the freshwater, and were at night nearly above the title influence. river here assumed a size and appearance which, even at the highest point, we ultimately reached, was scarcely diminished. It was generally from three to 400 yards broad, and in the middle about 17 feet deep, the rapidity of the current, which in its whole course runs at the rate of

from four to six knots an hour, is perhaps its most remarkable feature. The water is of a fine blue color, but with a slight milky tinge and not so transparent as that first sight would have been expected.

It flows over a bed of pebbles, like those which compose the beach and the surrounding plains. It runs in a winding course through a valley which extends in the direct line westward. This valley varies from five to ten miles in breadth. is bounded by step-formed terraces which rise in most parts, one above the other, to the height of 500 feet, and how on the opposite sides are remarkable correspondence. April 19th. It's so strong a current it was, of course, quite impossible to row or sail. Consequently, the three boats were fastened together, head and stern, two hands left in each, and the rest came on shore to track. As the general arrangements made by Captain Fitzroy were very good for facilitating

the work of all, and as all had a share in it, I will describe the system. The party, including everyone, was divided into two spells, each of which hauled at the tracking line and alternately for an hour and a half.

The officers of each boat lived with ate the same food and slept in the same tent with their crew, so that each boat was quite independent of the others. After sunset, the first level spot where any bushes were growing was chosen for our nights lodging. Each of the crew took it in turns to be cook. Immediately the boat was hauled up. The cook made his fire. Two others pitched the tent. The cock swain handed the things out of the boat. The rest carried them up to the tents and collected firewood. But this order, in half an hour, everything was ready for the night. A watch of two men and an officer was always kept, whose duty it was to look after the boats. Keep up the fire and guard against Indians. Each in the party had his one hour every night. During this day, we tracked by a short distance for there were many eyelids covered by thorny bushes and the channels between them were shallow. April 20th We passed the islands and set to work. Our regular days march, although it was hard enough, carried us on an average only ten miles in a straight line, and perhaps fifteen or twenty altogether. Beyond the place where we slept last night, the country is completely Terra in Gognita, for it was there that captain's stokes turned back. We saw in the distance a great smoke and found the skeleton of a horse, so we knew that Indians were in the neighborhood. On the next morning, tracks of a party horse and marks left by the trailing of the Chusos or long spheres were observed on the ground. It was generally thought that the indigenous had

reconnoitered us during the night. Shortly afterwards we came to a spot where from the fresh footsteps of men, children and horses, it was evident that the party had crossed the river. April 22nd the country remained the same and was extremely uninteresting. The complete similarity of the productions throughout Patagonia is one of its most striking characters. The level planes of arid chingles support the same stunted and dwarf plants. And in the valleys, the same thorn-bearing bushes grow. Everywhere we see the same birds and insects, even the very banks of the river and of the clear streamlets which interd it were scarcely inlive and by a brighter tint of green. The curse of sterility is on the land, and the water flowing over a bed of pebbles partakes of the same curse. Hence the number of waterfowls is very scanty, for there is nothing to support life in the stream of this barren river. Patagonia, poor as she is in some respects, can however boast of a greater stock of small rodents than perhaps any other country in the world. Several species of mice are externally characterized by large thin ears and a very fine fur, these little animals swarm amongst the thickets in the valleys, where they cannot for months together taste a drop of water, accepting the dew. They all seemed to be cannibals for no sooner was a mouse caught in one of my traps, that it was devoured by others. A small and delicately shaped fox, which is likewise very abundant, probably derives its entire support from these small animals. The guanaco is also in this proper district. Heard of 50 or 100 were common, and as I have stated, we saw one which must have contained at least 500. The Puma, with the condor and other carrying hawks and its train, follows and appraises upon these animals. The footsteps of the Puma were to be seen almost everywhere on the banks of the river, and there are mains of several guanacos. April 24th, like the navigators of old when approaching an unknown land, we examined and watched for the most trivial sign of a change, the drifted trunk of a tree, or a boulder of primitive rock, was hailed with joy, as if we had seen a forest growing on the flanks, the top, however, of a heavy bank of clouds, which remained almost constantly in one position, was the most promising sign and eventually turned out a true harbinger. At first the clouds were mistaken for the mountains themselves, instead of the masses of vapor condensed by their icy summits. April 26th, we this day met with a market change in the geological structure of the planes. From the first starting, I had carefully examined the gravel in the river, and for the last

two days had noticed the presence of a few small pebbles of a very cellular basalt. These gradually increased in number and in size, but none were as large as a man's head. This morning, however, pebbles of the same rock, but more compact, suddenly became abundant. And in the course of half an hour we saw, at the distance of five or six miles, the angular edge of a great basaltic platform. When we arrived at its base, we found the stream bubbling among the fallen blocks. For the next 28 miles, the river course was encumbered with these basaltic masses. Above that limit immense fragments of primitive rocks derived from its surrounding bolder formation,

were equally numerous. None of the fragments of any considerable size had been washed more than

three or four miles down the river below their parent's source, considering the singular

rapidity of the great body of water in the Santa Cruz, and that no still reaches occur in any part. This example is a most striking one of the inefficiency of rivers in transporting even moderately sized fragments. The basalt is only lava, which has flowed beneath the sea. But the eruptions must have been on the grandest scale at the point where we first met this formation. It was 120 feet in thickness. Following up the river course, the surface rose and the mass became thicker, so that at 40 miles above the first station it was 320 feet thick. What the thickness may be close to, the cordill era, I have no means of knowing, but the platform there attains a height of about 3,000 feet above the level of the sea. We must therefore look to the mountains of that great chain for its source, and worthy of such a source are streams that have flowed over the gently inclined bed of the sea to a distance of 100 miles. At the first glance of the both sultek cliffs on the opposite sides of the valley, it was evident that the strata once were united. What power then has removed along a whole line of country, a solid mass of very hard rock, which had an average thickness of nearly 300 feet, and a breadth faring from rather less than two miles to four miles.

The river, though it has so little power in transporting even inconsiderable fragments, yet in the laps of ages, might produce by its gradual erosion and effect of which it is difficult to judge the amount. in this case, independently of the insignificance of such an agency.

Good reasons. difficult to judge the amount. But in this case, independently of the insignificance of such an agency, good reasons can be assigned for believing that this valley was formally occupied by an arm of the sea. It is needless in this work to detail the arguments leading to this conclusion, derived from the form and the nature of the stepped-formed terraces on both sides of the valley, from the manner in which the bottom of the valley near the Andes expands into a great estuary-like plane with sand-hillocks on it, and from the occurrence of a few seashells lying in the bed of the river. If I had space, I could prove that South America was formally here cut off by a straight, joining the Atlantic into Pacific oceans, like that of Magellan. But it may yet be asked, how has the solid basalt been moved? Geologists formally would have brought into play the violent action of some overwhelming debacle. But in this case, such a supposition would have been quite inadmissible because the same step-like planes, with existing seashells lying on their surface, which front the long line of the Patagonian coast, sweep up on each side of the valley of Santa Cruz. No possible action of any flood could thus have modeled the land, either within the valley or along the open coast, and by the formation of such step-like plains or terraces, the valley itself had been hollowed out. Although we know that there are tides which run within the narrows of the straight of Magellan at the rate of eight knots an hour. Yet we must confess

that it makes the head almost giddy to reflect on the number of years, century after century, which the tides, unadid by a heavy surf, must have required to have corroded so vast an area, and thickness of solid, basaltic lava.

Nevertheless, have required to have corroded so vast an area in thickness of solid, basaltic lava.

Nevertheless, we must believe that the strata undermined by the waters of this ancient straight were broken up into huge fragments, and these lying scattered on the beach were reduced first to smaller blocks, then to pebbles, and lastly to the most impalpable mud, which the tides drifted far into the eastern or western ocean. With the change in the geological structure of the plains, the character of the landscape likewise altered, while rambling up some of the narrow and rocky defiles, I could almost have fancied myself transported back again to the barren valleys of the island of St. Yago. Among the balsaltic cliffs I found some plants which I had seen nowhere else, but others I recognized as being wanders from Tierra del Fuego. These porous rocks serve as a reservoir for the scanty rainwater and consequently on the line where the igneous and sedimentary formations unite. small springs, most rare occurrences in Patagonia burst forth, and they could be distinguished at a distance by the circumscribed patches of bright green urbic. April 27th. The bed of the river became rather narrower and hence the stream more rapid. It hear a ran at the rate of six knots an hour. From this cause and from the many great angular fragments, tracking the boats became both dangerous and laborious. This day I saw a condor. It measured from tip to tip of the wings eight and a half feet, and from beak to tail four feet. This bird is known to have had a wide geographical range, being found on the west coast of South America, from the straight of Magellan, as far as eight degrees north of the equator. The steep cliff near the mouth of the river is its northern limit on the Patagonian coast, and they have their wandered about 400 miles from the great central line of their habitations in the Andes. Further south, among the bold precipices at the head of Port Desaree, the condor is not uncommon. It only a few stragglers occasionally visit the sea coast. A line of cliff near the mouth of the Santa Cruz is frequented by these birds. And about 18 miles up the river, where the sides of the valley are formed by steep, sultic precipices, the condor reappears. From these facts, it seems that the condors require perpendicular cliffs. and chilly, they haunt during the greater part of the year, the lower country near the shores of the Pacific. And at night, several roost together in one tree, but in the early part of summer, they retire to the most inaccessible parts to breed in peace. When the condors are wheeling in a flock round and round any spot, their flight is beautiful. Yn yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n yw'n y