Definitions

from The Century Dictionary and Cyclopedia

  • n. A series of shaly gas-coal beds in the upper portion of the Permian Coal-measures of Pilsen, Bohemia, which has afforded valuable gas-producing bituminous shales and also is of high interest through its fauna and flora. It contains primitive Reptilia and Amphibia, fish, insects, spiders, scorpions, and ferns.

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