USGS Mesozoic 23062, Five Mile Creek (Cretaceous of the United States)

Where: Carter County, Montana (45.0° N, 104.3° W: paleocoordinates 44.5° N, 64.2° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Sciponoceras gracile ammonoid zone, Greenhorn Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Collected by J.B. Reeside, W.A. Cobban, H.R. Christner; 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 175421: authorized by Matthew Clapham, entered by Matthew Clapham on 11.12.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Scaphitidae
Yezoites delicatulus
 Ammonitida - Baculitidae
Sciponoceras gracile
Sciponoceras gracile Shumard 1860 ammonite
 Ammonitida - Anisoceratidae
Allocrioceras annulatum
 Ammonitida - Acanthoceratidae
Microsulcatoceras puzosiiforme n. gen. n. sp., "Sumitomoceras sp." = Tarrantoceras (Sumitomoceras), Buccinammonites minimus n. gen. n. sp., Metoicoceras geslinianum, Cryptometoicoceras mite, "Kanabiceras septemseriatum" = Euomphaloceras septemseriatum
Microsulcatoceras puzosiiforme n. gen. n. sp. Kennedy and Cobban 1990 ammonite
"Sumitomoceras sp." = Tarrantoceras (Sumitomoceras) Matsumoto 1969 ammonite
Buccinammonites minimus n. gen. n. sp. Kennedy and Cobban 1990 ammonite
Metoicoceras geslinianum d'Orbigny 1841 ammonite
Cryptometoicoceras mite Kennedy and Cobban 1990 ammonite
"Kanabiceras septemseriatum" = Euomphaloceras septemseriatum Cragin 1893 ammonite
 Ammonitida - Binneyitidae
"Borissiakoceras sp." = Borissjakoceras
"Borissiakoceras sp." = Borissjakoceras Arkhangel'skii 1916 ammonite