AMNH B6821, Bull Lake, Fremont County (Permian of the United States)

Where: Wyoming (43.2° N, 109.2° W: paleocoordinates 14.5° N, 31.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Franson Member (Park City Formation), Wuchiapingian (259.9 - 254.2 Ma)

• Basal beds. Davydov et al. 2017 dated an ash bed in the upper Meade Peak Member at 260.57 ± 0.07 / 0.14 / 0.31 Ma, indicating that the Meade Peak is as young as uppermost Capitanian.

• bed-level stratigraphic resolution

Environment/lithology: marine; lime mudstone and calcareous grainstone

Size class: macrofossils

Preservation: replaced with silica

Reposited in the AMNH

• University of Washington Museum

Primary reference: N. D. Newell and D.W. Boyd. 1995. Pectinoid bivalves of the Permian-Triassic crisis. Bulletin of the American Museum of Natural History 227:1-95 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 61936: authorized by Pete Wagner, entered by Pete Wagner on 08.07.2006, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Demospongiae
 Lithistida - Anthaspidellidae
Virgaspongiella ramosa n. gen. n. sp.2, Incrustatospongia superficiala n. gen. n. sp.2
Virgaspongiella ramosa n. gen. n. sp.2 Rigby and Boyd 2004 demosponge
4 well preserved, 5 probable but with skeletal structure destroyed
Incrustatospongia superficiala n. gen. n. sp.2 Rigby and Boyd 2004 demosponge
Strophomenata
 Productida - Strophalosiidae
Sphenalosia sp.2 Muir-Wood and Cooper 1960
Gastropoda
 Bellerophontida - Euphemitidae
Warthia cf. waageni1 Yochelson 1960 snail
Euphemites fremontensis n. sp.1 Kulas and Batten 1997 snail
Euphemites luxuriosus1 Yochelson 1960 snail
 Heterostropha - Donaldinidae
? Donaldina sp.1 Knight 1933 snail
 Zygopleuroidea - Pseudozygopleuridae
"Pseudozygopleura (Pseudozygopleura) croneisi" = Pseudozygopleura croneisi1
"Pseudozygopleura (Pseudozygopleura) croneisi" = Pseudozygopleura croneisi1 Knight 1930 snail
 Caenogastropoda - Meekospiridae
Ceraunocochlis sp.1 Knight 1931 snail
closest to C. blatta
 Cerithimorpha - Orthonemidae
"Goniasma cf. geminocarinata" = Donaldospira geminocarinata1, "Stegocoelia (? Hypergonia) sp." = Hypergonia1
"Goniasma cf. geminocarinata" = Donaldospira geminocarinata1 Chronic 1952 snail
"Stegocoelia (? Hypergonia) sp." = Hypergonia1 Donald 1892 snail
 Caenogastropoda - Orthonematidae
? Orthonema sp.1 Meek and Worthen 1862 snail
cf. O. inornatum or socorroense
 Murchisoniina - Soleniscidae
Soleniscidae indet.1 Knight 1931 snail
Strobeus cf. intercalaris1 Meek and Worthen 1860 snail
Soleniscus typicus1 Meek and Worthen 1860 snail
Strobeus primogenius1 Conrad 1835 snail
 Murchisoniina - Gosseletinidae
"Glabrocingulum (Glabrocingulum) texanum" = Glabrocingulum texanum1, "Glabrocingulum (Glabrocingulum) coronatum" = Glabrocingulum coronatum1, ? Apachella pseudostrigillata1, Apachella turbiniformis1, Apachella capertoni1
"Glabrocingulum (Glabrocingulum) texanum" = Glabrocingulum texanum1 Batten 1989 snail
"Glabrocingulum (Glabrocingulum) coronatum" = Glabrocingulum coronatum1 Chronic 1952 snail
Apachella turbiniformis1 Winters 1963 snail
Apachella capertoni1 Beede 1907 snail
 Neritoidea - Naticopsidae