USNM806m, 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: Anidanthus zone Formation, Wordian (268.8 - 265.1 Ma)

• "Monos Beds"; Anidanthus zone includes two lowest zones in the succession

Environment/lithology: marine; concretionary, blue limestone

• Bluish limestone containing black concretions

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 40831: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Fusulinoidea - Schwagerinidae
Parafusulina sp. Dunbar and Skinner 1931
 Trigoniida - Schizodidae
Schizodus parvulus Cooper 1953 clam
 Cyrtoneritimorpha - Orthonychiidae
Orthonychia "sp. A" Hall 1843 snail
 Dentaliida - Prodentaliidae
"Plagioglypta canna" = Prodentalium canna
"Plagioglypta canna" = Prodentalium canna White 1874 tusk shell
 Productida - Productellidae
Liosotella rugosa Cooper 1953
 Productida - Productidae
"Dictyoclostus depressus" = Thamnosia depressa
"Dictyoclostus depressus" = Thamnosia depressa Cooper 1953
 Productida - Linoproductidae
"Anidanthus alatus" = Megousia alata
"Anidanthus alatus" = Megousia alata Cooper 1953
 Orthotetida - Derbyiidae
Derbyia elongata n. sp. Cooper 1953
Derbyia arellanoi Cooper 1953
 Spiriferida - Trigonotretidae
Neospirifer sp. Fredericks 1919
 Spiriferida - Spiriferellidae
 Rhynchonellida - Rhynchoporidae
Porifera indet. Grant 1836