King 29, Bed 7, La Difunta section, Las Delicias (Permian of Mexico)

Where: Coahuila, Mexico (26.3° N, 102.9° W: paleocoordinates 1.6° S, 34.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: La Difunta Formation, Capitanian (264.3 - 259.5 Ma)

• Upper Guadalupe (Capitan-Bell Canyon-Altuda). Approximately equivalent to the Pichaguilla limestone.

Environment/lithology: marine; lithified, black shale

• Black shale containing some ammonoids, though less abundantly than bed 5; in southern part of area containing lenticular limestone masses which consolidate south of Cerro Pichaguilla into a continuous limestone layer (from section description, p. 13). Black concretionary shale, with persistent limestone layers in lower part in southern portion of area. Beds 4 to 7 (From a general stratigraphy table, Fig. 3, p. 19).

Size classes: macrofossils, microfossils

Reposited in the YPM

Primary reference: R. E. King. 1944. Geology, Part I of Geology and paleontology of the Permian area northwest of Las Delicias, southwestern Coahulia, Mexico. Geological Society of America Special Paper 52:3-33 [T. Olszewski/L. Fall/L. Fall]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 62911: authorized by Tom Olszewski, entered by Leigh Fall on 01.08.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Foraminifera
 Fusulinoidea - Schwagerinidae
Polydiexodina shumardi
Polydiexodina shumardi Dunbar and Skinner 1931
 Fusulinoidea - Staffellidae
Staffella fountaini
Staffella fountaini Dunbar and Skinner 1937
Strophomenata
 Productida -
Prorichthofenia permiana