USNM806t, 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 (268.8 - 265.1 Ma)

• "Monos Beds"; "Highest Permian" (Wordian in this area), likely immediately above highest Spiriferellina Zone

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/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40842: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Bellerophontida - Euphemitidae
Warthia "sp. A" Waagen 1880 snail
Strophomenata
 Productida - Productidae
"Dictyoclostus depressus" = Thamnosia depressa
"Dictyoclostus depressus" = Thamnosia depressa Cooper 1953