GRITSTONE a type of coarse sandstone
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gritstonesGRITSTONE, a type of coarse sandstone
gritstonea type of coarse sandstone
graywackesA dark coarse-grained sandstone containing more than 15 percent clay
graywackeA dark coarse-grained sandstone containing more than 15 percent clay
graywackeany coarse-grained, usually dark sandstone containing angular mineral and rock fragments in a fine-grained clayey matrix also GREYWACKE, WACKE
greywackeany coarse-grained, usually dark sandstone containing angular mineral and rock fragments in a fine-grained clayey matrix also GRAYWACKE, WACKE
greywackesGREYWACKE, any coarse-grained, usually dark sandstone containing angular mineral and rock fragments in a fine-grained clayey matrix also GRAYWACKE, WACKE
graywackesGRAYWACKE, any coarse-grained, usually dark sandstone containing angular mineral and rock fragments in a fine-grained clayey matrix also GREYWACKE, WACKE