Color patterns in Mississippian (Chesterian) blastoids

From: Journal of Paleontology | Date: March 1, 1998| Author: | Copyright information

ABSTRACT-Ninety-one specimens of Pentremites Say from the Mississippian Chesterian display color patterns. The darker color patterns represent a thin veneer of pigmented calcite which is barely visible on a polished surface or thin section, but which can be removed with dilute hydrochloric acid. Preservation appears to be best in specimens from shallow marine clays and shales. The patterns represent four color patterns, each consisting of different shades of calcite, and ranging in color from tan to black. Color patterns generally, but not always, cross growth lines. Type 1 has arched chevron ...

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