USNM9257, Cerro el Volcancillo (FS-67-G-1) (Permian of Guatemala)

Where: Huehuetenango, Guatemala (15.6° N, 92.0° W: paleocoordinates 15.6° N, 92.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Upper Shaly Member (Chochal Formation), Kungurian (279.3 - 272.3 Ma)

• Ammonoid, fusulinid, and brachiopod correlations suggest similarity to "Leonard" of West Texas, specifically Skinner Ranch, Cathedral Mountain, and Road Canyon (Artinskian-Roadian). Collected from a limestone lens in the lower part of the shaly beds, within the first 20 m above the main body of the Chochal Formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, black, gray, silty limestone

• Lithology description reminiscent of slope lithologies of Road Canyon Formation.
• Consists primarily of thin-bedded, dark gray to black calcilutite but occasional thicker beds contain significant amounts of bioclastic debris and quartz silt though they are still very dark in color. Strongly deformed and often tightly folded.

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical,

• Several hundred pounds of limestone collected from both localities. Also includes verbeekinid fusulinids, trilobites, durhaminid and lophophyllid corals, ammonites, Mizzia, fish teeth, and fragments of vascular plants. It is not specified which of the two localities (USNM9257 or 9258) these occur at. Only brachiopods are listed.

Primary reference: F.G. Stehli and R. E. Grant. 1970. Permian brachiopods from Huehuetenango, Guatemala. Journal of Paleontology 44(1):23-36 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41536: authorized by David Bottjer, entered by Matthew Clapham on 16.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Goniatitida - Paragastrioceratidae
Stenolobulites "n. sp." Mikesh et al. 1988 ammonite
 Productida - Productellidae
Echinauris sp. Muir-Wood and Cooper 1960
 Productida - Hercosiidae
Hercosestria notialis Stehli and Grant 1970
 Orthotetida - Meekellidae
 Athyridida - Neoretziidae
Hustedia sp. Hall and Clarke 1893
 Athyridida - Athyrididae
Composita sp. Brown 1849
Composita hapsida n. sp. Stehli and Grant 1970
 Terebratulida - Pseudodielasmatidae
? Oligothyrina sp. Cooper 1956
 Spiriferinida - Spiriferinidae
Spiriferinidae indet. Davidson 1884
 Rhynchonellida - Pontisiidae
Pontisia sp. Cooper and Grant 1969