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Updated: July 15, 2025
They are chert, which abound in the greensand formation; and insignificant as they look, are a great token of a most important fact; that the currents which formed our sands and gravels set from the south during a long series of ages, first till they had washed away all the chalk off the Weald, and next till they had washed away a great part of the sands, which then became exposed, the remains whereof form great commons over a wide tract of Surrey.
The most important of the ancient river-channels in this region is a section that extends from the south side of the town beneath Coyote Creek and the ridge beyond it to the Cañon of the Stanislaus; but on account of its depth below the general surface of the present valleys the rich gold gravels it is known to contain cannot be easily worked on a large scale.
Behind the terminal moraines lie wide till plains, in places studded thickly with drumlins, or ridged with an occasional esker. Great outwash plains of sand and gravel lie in front of the moraine belts, and long valley trains of coarse gravels tell of the swift and powerful rivers of the time. Much of the loess was deposited in Iowan times.
Let us suppose, then, the era of 'gravels' past; the valleys which open into the fen sawn out by rivers to about their present depth. What was the special cause of the fen itself? why did not the great lowland become a fertile 'carse' of firm alluvial soil, like that of Stirling?
And seeing them so dispirited and marking also the many wonderful portents, that foremost of all wielders of arms, the preceptor Drona, son of Bharadwaja, said, 'Violent and hot are the winds that below, showering gravels in profusion. The sky also is overcast with a gloom of ashy hue. The clouds present the strange sight of being dry and waterless.
Professor Hull, in a recent paper on the subject, states the fact of the plains of Hungary being "overspread by sands, gravels, and a kind of mud called loess, or by alluvial deposits underlaid by fresh-water limestones, which may be considered as having been formed beneath an inland lake, during different periods of repletion or partial exhaustion, dating downwards from the Miocene period."
If any such lie hid in those strata, and should hereafter be revealed to us, they would carry back the antiquity of Man to a distance of time probably more than twice as great as that which separates our era from that of the most ancient of the tool-bearing gravels yet discovered in Picardy, or elsewhere.
Unhappily, the risk of river floods is peculiarly great in all the regions of the United States lying much to the east of the Rocky Mountains, except in the basin of the Great Lakes and in the district of New England, where the prevalence of glacial sands and gravels affords the protection which we have noted.
But remember, that when you ran through the chalk hills to Reading, you passed from the bottom of the chalk to the top of it, on to the Thames gravels, which lie there on the chalk, and on to the London clay, which lies on the chalk also, with the Thames gravels always over it.
With an axe and an auger they have dotted their rough habitations all over the country; with a pick and a shovel and a gold pan they have tested the gravels of innumerable creeks. They know the drainage slopes and the practicable mountain passes, the haunts of the moose and the time and direction of the caribou's wanderings.
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