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Updated: May 6, 2025
When such fine vegetable sediment is mixed, as is often the case, with clay, it becomes similar to the bituminous limestone and calcareo-bituminous shales of the coal-measures.
Here and there, also, deposits bearing testimony to the existence of fresh or brackish- water lagoons, filled with calcareo-bituminous mud, were formed. They are associated with small entomostracous crustaceans of the genus Cythere, and scales of small fishes.
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