单词	mudstone
释义	mudstone /ˈmʌdstəʊn / noun [mass noun] A dark sedimentary rock formed from consolidated mud and lacking the laminations of shale.The sedimentary lenses are composed of limestone, sandstone, siltstone, mudstone, shale, chert and well-bedded calci-turbidite.... The matrix varies in composition from black shale to carbonate mudstone and quartzose siltstone. The upper contacts are mostly sharp and overlain by interbedded mudstone, dark brown mudstone, laminated mudstone and occasionally fine-grained sandstone. Rhymes bloodstone
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