USNM806n, 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"; Anidanthus Zone incorporates two lowest zones in the succession

Environment/lithology: marine; limestone

• 40 or 50 feet of moderately heavy bedded limestone that weathers to an orange or reddish colour

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 40834: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Trigoniida - Schizodidae
Schizodus parvulus Cooper 1953 clam
Strophomenata
 Productida - Echinoconchidae
 Productida - Productellidae
Liosotella angustata n. sp., Liosotella rugosa n. gen. n. sp.
Liosotella angustata n. sp. Cooper 1953
Liosotella rugosa n. gen. n. sp. Cooper 1953
 Productida - Productidae
"Dictyoclostus depressus" = Thamnosia depressa
"Dictyoclostus depressus" = Thamnosia depressa Cooper 1953
 Productida - Linoproductidae
"Anidanthus alatus n. sp." = Megousia alata
"Anidanthus alatus n. sp." = Megousia alata Cooper 1953
 Orthotetida - Derbyiidae
Derbyia elongata Cooper 1953
Derbyia arellanoi n. sp. Cooper 1953
Rhynchonellata
 Spiriferinida - Spiriferellinidae
 Spiriferida - Spiriferellidae
? Spiriferella scobinoidea n. sp. Cooper 1953
 Rhynchonellida - Rhynchoporidae
Hexactinellida
 Reticulosa - Docodermatidae
Docoderma sp.2 Finks 1960 glass sponge