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The Pampean mud is here of a rather pale colour, and includes small nearly white nodules, and other irregular strata of an unusually arenaceous variety of tosca-rock. In a well at the depth of seventy feet, according to Ignatio Nunez, much tosca-rock was met with, and at several points, at one hundred feet deep, beds of sand have been found.
There was for all that a danger, great as it was imminent; the danger, not only of their being "smoored", but stifled, suffocated, buried fathoms deep under the sands of the Saara; for fathoms deep will often be the drift of a single night. The Arabs say that, once "submerged" beneath the arenaceous "flood", a man loses the power to extricate himself.
He threw himself down and rolled himself in the abundance of fine, dry, clean sand. "An arenaceous ulster speaking etymologically," he said. He came back to the clump of basswoods near which Randolph was sitting on a short length of drift wood, with his back to the sun, and sat down beside him. "You're welcome to it," said Randolph, laughing; "but how are you going to get it off? By another dip?
It must not be alleged, that the heights of the Oural mountains, or the hardness of their rocks, make an essential distinction between them and the argillaceous or arenaceous strata of the plains; solidity and hardness, as well as changes in their height and natural position, has been superinduced in operations posterior to the collection of those masses, operations which may be formed in various degrees, even in the different parts of the same mass.
After heavy showers the naked eye can note spangles of the precious metal in the street-roads. You can pan it out of the wall-swish. The little stream-beds, bone-dry throughout the hot season, roll down, during the rains, a quantity of dark arenaceous matter, like that of Taranaki, New Zealand, and the 'black sand' of Australia, which collects near the sea in stripes and patches.
So again with land animals: the differences in their stations are those of different soils and neighbourhoods; some being best adapted to a calcareous, and others to an arenaceous soil.
The Sierra Larga, a low range five miles west of Maldonado, consists of quartzite, often ferruginous, having an arenaceous feel, and divided into excessively thin, almost vertical laminae or folia by microscopically minute scales, apparently of mica, and striking in the usual N.N.E. and S.S.W. direction.
The arenaceous division, the marls, and the limestone may all be seen in some places to alternate with each other; yet it can by no means be affirmed that there is no order of arrangement.
So again with land animals: the differences in their stations are those of different soils and neighbourhoods; some being best adapted to a calcareous, and others to an arenaceous soil.
In places the gneiss has been so little changed by heat and pressure that it forms arenaceous flags and shales. It suggests a deposit in some ancient lagoon, alternately fresh and salt.
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