from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A metamorphic rock, intermediate between shale and slate, that does not possess true slaty cleavage.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fine-grained sedimentary rock, intermediate between shale and slate, sometimes used as a building material
from the GNU version of the Collaborative International Dictionary of English
- n. Argillaceous schist or slate; clay slate. Its colors is bluish or blackish gray, sometimes greenish gray, brownish red, etc.
from The Century Dictionary and Cyclopedia
- n. Argillaceous schist or slate; clay slate (which see, under clay).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages
Indeed, the art of the argillite is a story of resistance.
For years there have been "argillite" replicas of the Haida carvings - made who knows where?
Soils from argillite are clayey, poorly drained, and have hardpans in lower horizons.
On poorly drained, clayey soils with hardpans that were derived from argillite, native vegetation is a mosaic of red maple, swamp hardwoods, and mixed oaks, including pin oak.
Ecoregion 84d is lithologically distinct from the reddish shale, sandstone, argillite, and siltstone of the neighboring Triassic Lowlands (64a).
In New Jersey, Triassic brownish red, shale, sandstone, and argillite are extensive; these sedimentary rocks are much less resistant to erosion than the metamorphic crystalline rocks that form the core of the adjacent Northeastern Highlands (58).
Portions are underlain by argillite and quartzite; they have substantially different water quality and fish assemblages than other areas underlain by limestone and dolomite.
The rocks of the North Island's rugged axial ranges are older, brittle, sedimentary rocks (greywacke and argillite) that broke up into a series of blocks (or ranges) along major fault lines as they were uplifted.
The soils of Ecoregion 64a were derived from Triassic sandstone, shale, siltstone, and argillite of the Brunswick, Stockton, Lockatong, Gettysburg, and New Oxford formations; lithology is distinct from the metamorphic rocks of the surrounding portions of the Piedmont.
It is underlain by quartzite and argillite; the lithologic mosaic and related slope stability and water quality issues are unlike those of Ecoregion 16k.