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lithic graywacke

A graywacke characterized by abundant unstable materials; specif. a sandstone containing a variable amount (generally less than 75%) of quartz and chert and 15% to 75% detrital-clay matrix, and having rock fragments (primarily of sedimentary or lowrank metamorphic origin) in greater abundance than feldspar grains (chiefly sodic plagioclase, indicating a plutonic provenance).

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