Ref: Stoddard, Edward F. (2004),Petrographic Characteristics Of Rock Samples From Selected Archaeological Quarry Sites, Central North Carolina Piedmont, Paper No.24-5, in: Steponaitis, Vinca P., Jeffrey D. Irwin, Theresa E. McReynolds, Christopher Moore (2006),Stone Quarries and Sourcing in the Carolina Slate Belt. Research Report No.25, Univeristy of North Carolina, Chapel Hill (www.ria.unc.edu/Publications/Res_reports.html): 51, 57.
A paleo-quarry in rhyodacite and dacite comprised of purple, dark gray, or black heterolithic volcanic breccia, tuff breccia, lapilli tuff, and crystal-lithic tuff containing abundant intermediate to mafic pyroclastic fragments as well as more abundant felsic ones. Phenocrysts are plagioclase plus local K-feldspar. Amygdules of quartz plus epidote are also present. (Stoddard in Steponaitis et al).
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