from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A fine-grained, dark gray to pink sedimentary rock consisting primarily of compacted and hardened clay.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology
sedimentary rockcomposed of fine, clayparticles
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun fine-grained rock consisting of compacted clay particles
Sorry, no etymologies found.
The layer of sandstone with quartzite intrusions and interlayered with claystone, conglomerate and Mesozoic dykes of diorite, was cracked by tectonic movements and then dissected and eroded for 220 million years.
These hills are associated primarily with the resistant claystone and sandstone of the Eocene-age Tallahatta Formation, and are part of the rugged, north-facing escarpment or cuesta that extends into the middle of Alabama.
Olean Till, glacial outwash, glacial lake deposits, and Recent alluvium partly overlie gently dipping Devonian age sandstone, siltstone, claystone, and shale.
Soils formed from claystone, shale, sandstone, and mudstone are found west of Meeker, and in the Colorado River valley near Rifle.
We have it in claystone porphyry here, in minute round globules, no larger than turnip-seed, dotted thickly over the matrix; or crystallized round the walls of cavities, once filled with air or other elastic fluid; or it may appear in similar cavities as tufts of yellow asbestos, or as red, yellow, or green crystals, or in laminae so arranged as to appear like fossil wood.
This island, from what little I saw of it, appears to be composed of a reddish indurated claystone, very hard, portions of it having evidently been under the action of fire; near the water-side were strong indication of iron, some of the small boulders near the beach had large quantities of iron in their composition.
Many of the hills composed of claystone are neatly devoid of vegetation; their surface being bare and smooth, and of a red or black colour.
The walls are hung with hideous shapes and skins of wild beasts; in which ever way I turn, I am attracted by odd shapes, such as the fierce visage of the grizzly bear, the white buffalo and panther; while interspersed among the horns of the cimmaron, elk and bison, are grim idols carved from the red claystone of the desert.
In some parts of India, the claystone contains numerous small _nodules_ or lumps of clay iron-stone, which seldom exceed the size of a walnut.
Why should the schist pendant of the Tappock chamber be all right, if the claystone pendant of Dunbuie be all wrong?