an indurated marl.
Also called marlite [mahr-lahyt] .

1830–40; marl1 + stone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
marlite or marlstone (ˈmɑːlaɪt, ˈmɑːlˌstəʊn)
a type of marl that contains clay and calcium carbonate and is resistant to the decomposing action of air
marlstone or marlstone

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Fragmented shells of freshwater molluscs and an ostracod occur within a marlstone bed.
The lower member includes thin partings of gray siltstone, many partings of brown marlstone and gray limestone.
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