GRAYWACKE is validvalid

any coarse-grained, usually dark sandstone containing angular mineral and rock fragments in a fine-grained clayey matrix, also GREYWACKE

100,744 of 196,601 in NWL2023·also valid in CSW24

any coarse-grained, usually dark sandstone containing angular mineral and rock fragments in a fine-grained clayey matrix, also GREYWACKE

102,723 of 280,887 in CSW24·also valid in NWL2023

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