USNM806x, Cerros de los Monos, El Antimonio, Sonora (Permian of Mexico)

Where: Sonora, Mexico (30.8° N, 112.6° W: paleocoordinates 11.7° N, 40.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Antimonio Formation, Wordian (266.9 - 264.3 Ma)

• "Monos Beds"; Dictyoclostus Zone is fourth-highest of the succession

Environment/lithology: marine; limestone

Size class: macrofossils

Preservation: replaced with silica

Primary reference: G. A. Cooper, C. O. Dunbar, H. Duncan, A. K. Miller, and J. B. Knight. 1953. Permian fauna at El Antimonio, western Sonora, Mexico. Smithsonian Miscellaneous Collections 119(2):1-111 [D. Bottjer/M. Clapham/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40848: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Spiriferinida - Reticulariinidae
"Spiriferellina sonorensis" = Reticulariina sonorensis
"Spiriferellina sonorensis" = Reticulariina sonorensis Cooper 1953
 Athyridida - Athyrididae
Composita grandis Cooper 1953
Strophomenata
 Productida - Paucispiniferidae
Liosotella rugosa Cooper 1953
 Productida - Productellidae
"Dictyoclostus depressus" = Thamnosia depressa
"Dictyoclostus depressus" = Thamnosia depressa Cooper 1953