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Where fine clays are now found on the land in even, horizontal layers containing the remains of fresh-water animals and plants, uncut by channels tilled with cross-bedded gravels and sands and bordered by beach deposits of coarse waste, we may safely infer the existence of ancient lakes.
Jamieson, contains, near Fort William and on Loch Fyne and elsewhere, an assemblage of shells implying a colder climate than that of the 25-foot terrace, or that of the present sea; just as, in the valley of the Somme, the higher-level gravels are supposed to belong to a colder period than the lower ones, and still more decidedly than that of the present era.
Accordingly there was no longer any necessity to ascribe great antiquity to the bones or the wall which we found in the Ayahuaycco quebrada. Although the "Cuzco gravels are believed to have reached their greatest extent and thickness in late Pleistocene times," more recent deposits have, however, been superimposed on top and alongside of them.
You most of you have seen, I dare say, large stones, several feet long, taken out of these pits. In the gravels and sands at Pirbright they are so plentiful that they are quarried for building-stone. And good building-stone they make; being exceedingly hard, so that no weather will wear them away. If you chip off a bit, you find it exactly like fine whity-brown sugar, only intensely hard.
In the valley of the Somme we have seen that peat exists of great thickness, containing in its upper layers Roman and Celtic memorials, the whole of which has been of slow growth, in basins or depressions conforming to the present contour and drainage levels of the country, and long posterior in date to older gravels, containing bones of the mammoth and a large number of flint implements of a very rude and antique type.
It stands to reason then, that the closer you get to it, the closer you get to pure romance. And it isn't that way at all. What gravels a boy the most of all is to have to do the same old thing over and over again, day after day, week in, week out.
For centuries, ever since the melting of the great glaciers which once descended the Cascade Range and crept down the sound, the river has been building this delta. It grew rapidly, for immense accumulations of gravels and clays were left by the retreating glaciers. The delta has already spread westward into the sound, until it has enveloped some of the smaller islands.
That convulsion covered up the rich clays with those barren sands and gravels, which now rise in flat and dreary steppes, on the Beacon Hill, Aldershot Moors, Hartford Bridge Flat, Frimley ridges, and Windsor Forest.
Above these are gravels brought down by the floods and landslides of more modern times, in which may be found potsherds and bones. One of the chief affluents of the Huatanay is the Chunchullumayo, which cuts off the southernmost third of Cuzco from the center of the city. Its banks are terraced and are still used for gardens and food crops.
A careful search was made up and down canyons and gulches. At length, during the latter part of the day, they reached the bank of a dry creek which disclosed strata similar to the auriferous gravels of California. Looking about, Hargraves found a spot in the bed of the creek from which, after scooping off the top, he scraped from the bedrock a panful of earth.
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