Earle F. McBride; The term graywacke. Journal of Sedimentary Research ; 32 (3): 614–615. doi: https://doi.org/10.1306/74D70D3A-2B21-11D7-8648000102C1865D
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The term graywacke should be retained but applied only to indurated sandstones composed of more than 15% of chlorite-sericite matrix, more than 10% unstable fine-grained rock fragments, and more than 5% feldspar.
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