stratum

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The proletariat, the lowest stratum of our present society, cannot stir, cannot raise itself up, without the whole superincumbent strata of official society being sprung into the air.
And moreover, how about three oyster beds, one above another, and thick strata of good honest earth between?
Look there," I said, pointing to the strata of stiff blue clay which were yet to be seen among the grass and bushes that clothed the sides of the pit, "the formation is the same.
During the next three hours we passed through ten miles of ice, eventually emerging into another series of ammonia-impregnated strata, where the mercury again fell to ten degrees below zero.
I had matches with me, and in the light of one I found a small cavern with a flat roof and floor which followed the cleavage of the strata.
I could not cope with them all, and so I rose rapidly from among them to the cooler strata wherein they dared not follow; and then I recalled that Bowen's narrative distinctly indicated that the farther north one traveled in Caspak, the fewer were the terrible reptiles which rendered human life impossible at the southern end of the island.
If ever geologists should by any chance live upon earth again they will have some strange theories of the existence of man in carboniferous strata.
I was on the bridge, and as we dropped from the brilliant sunlight into the dense vapor of clouds and on down through them to the wild, dark storm strata beneath, it seemed that my spirits dropped with the falling ship, and the buoyancy of hope ran low in sympathy.
But the heat developed by the rapidity of the projectile in crossing the strata of air?
This stifling heat, penetrating through the partitions of the projectile, is produced by its friction on the atmospheric strata.
In the diagram, each horizontal line has hitherto been supposed to represent a thousand generations, but each may represent a million or hundred million generations, and likewise a section of the successive strata of the earth's crust including extinct remains.
Helena, however, I ascertained that some pinnacles, of a nearly similar figure and constitution, had been formed by the injection of melted rock into yielding strata, which thus had formed the moulds for these gigantic obelisks.