marlstone

noun
marl·stone | \ ˈmär(-ə)l-ˌstōn \

Definition of marlstone 

: a rock that consists of a mixture of clay materials and calcium carbonate and often contains kerogen

First Known Use of marlstone

1756, in the meaning defined above

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Dictionary Entries near marlstone

Marlovian

Marlowe

marlpit

marlstone

marm

marmalade

marmalade box

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The first known use of marlstone was in 1756

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