Where: Weston County, Wyoming (44.1° N, 104.6° W: paleocoordinates 43.7° N, 64.9° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Dunveganoceras pondi ammonoid zone, Belle Fourche Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)
• Probably from low in the zone of Dunveganoceras pondi. 19.8 m (65 feet) above 0.6 m (2 feet) bentonite.
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified siliciclastic sediments
Size class: macrofossils
Preservation: concretion
Reposited in the USNM
Primary reference: W. J. Kennedy and W. A. Cobban. 1990. Cenomanian micromorphic ammonites from the western interior of the USA. Palaeontology 33:379-422 [M. Clapham/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 167809: authorized by Matthew Clapham, entered by Matthew Clapham on 03.04.2015
Creative Commons license: CC BY (attribution)
Taxonomic list
| Cephalopoda | |
|
Borissiakoceras cf. orbiculatum Stephenson 1955 ammonite | |
|
Hamites cimarronensis Kauffman and Powell 1977 ammonite | |
|
Idiohamites bispinosus Kennedy and Cobban 1990 ammonite | |
|
Moremanoceras costatum Cobban et al. 1989 ammonite | |
Tarrantoceras sp., ? Alzadites sp., Alzadites westonensis n. sp., Neocardioceras sp., Neocardioceras laevigatum n. sp., Neocardioceras uptonense n. sp., Plesiacanthoceras cf. bellsanum, "Plesiacanthoceras cf. wyomingense" = Dunveganoceras (Plesiacanthoceras) wyomingense, Metoicoceras "sp. A"
Tarrantoceras sp. Stephenson 1955 ammonite
? Alzadites sp. Kennedy and Cobban 1990 ammonite
Alzadites westonensis n. sp. Kennedy and Cobban 1990 ammonite
Neocardioceras sp. Spath 1926 ammonite
Neocardioceras laevigatum n. sp. Cobban 1988 ammonite
Neocardioceras uptonense n. sp. Cobban 1988 ammonite
Plesiacanthoceras cf. bellsanum Stephenson 1953 ammonite
"Plesiacanthoceras cf. wyomingense" = Dunveganoceras (Plesiacanthoceras) wyomingense Reagan 1924 ammonite
Metoicoceras "sp. A" Hyatt 1903 ammonite | |