Noun
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rock formed from consolidated clay sediments
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rock,
stone pitching dangerously to one side
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argillite a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages
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arenaceous rock a sedimentary rock composed of sand
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argillaceous rock a sedimentary rock formed from clay deposits
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rudaceous rock a sedimentary rock formed of coarse-grained material
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slate (formerly) a writing tablet made of slate
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limestone a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
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