L-491 (Agate Geode): Collection includes raw material, outer surface, surrounding matrix, and naturally-weathered specimens. L-491 (Agate Geode) (Information obtained from Briar Creek Type Sheet) ...
L-23 (Little Colorado River Gravel Chert, Petrified Wood, Agate, Chalcedony): Not a direct collection from outcrop; Provenience includes samples from gravel deposits; Collection includes raw material, ...
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