Definitions
from The Century Dictionary.
- noun Calcareous shale; a variety of marl splitting into thin plates.
Etymologies
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Examples
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Carboniferous period were deposited the vast coal-measures that yield us our chief combustive material; in the Permian (or the Dyas), in fine, the new red sandstone, the Zechstein (magnesian limestone), and the Kupferschiefer (marl-slate) were formed.
The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876
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