caa a22 4500 388017279 CHVBK 20180307124914.0 cr unu---uuuuu 161130e199803 xx s 000 0 eng 10.1017/S0022336000036313 doi S0022336000036313 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000036313 Color patterns in Mississippian (Chesterian) blastoids [Elektronische Daten] [Harold H. Beaver, Alexander J. Fabian] 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 patterns on the deltoids, horizontal lines on the radials, and triangular bands on the basals. Type 2 has darkened deltoids or concave chevrons on the deltoids and darkened areas concentric to the radials, and sometimes alternating light and dark bands conforming to growth lines on the radials. Type 3 has sloping lines crossing the radials, concave chevrons on the deltoids, and darkened areas on the lower radials, concentric to the ambulacra and on the basals. Type 4 has dark dots concentric to the lower ambulacra, arched chevrons on the deltoids and transverse lines abutting the radials and on the basals. The color patterns are original and may have been exposed on the outside of the integument. Copyright © The Paleontological Society Beaver Harold H. Department of Geology, Baylor University, Waco, Texas 76798 aut Fabian Alexander J. 7016 Jackman Rd., Temperance, Michigan 48182 aut Journal of Paleontology Cambridge University Press 72/2(1998-03), 332-338 0022-3360 72:2<332 1998 72 JPA https://doi.org/10.1017/S0022336000036313 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000036313 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beaver Harold H. Department of Geology, Baylor University, Waco, Texas 76798 aut NATIONALLICENCE 700 1- Fabian Alexander J. 7016 Jackman Rd., Temperance, Michigan 48182 aut NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/2(1998-03), 332-338 0022-3360 72:2<332 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge