Conger Ranch, SDSM V9011 (Cretaceous of the United States)

Where: Fall River County, South Dakota (43.4° N, 103.3° W: paleocoordinates 49.3° N, 71.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Niobrara Formation, Early/Lower Campanian (83.5 - 70.6 Ma)

• uppermost Niobrara Formation, a meter below the Niobrara-Pierre Shale contact

• bed-level stratigraphic resolution

Environment/lithology: marine; bentonitic, yellow chalk

• yellow-tan argillaceous chalk, with bentonite

Size class: macrofossils

Collected in 1990; reposited in the SDSM

Primary reference: B. A. Schumacher and J. E. Martin. 2016. Polycotylus latipinnis Cope (Plesiosauria, Polycotylidae), a nearly complete skeleton from the Niobrara Formation (Early Campanian) of southwestern South Dakota. Journal of Vertebrate Paleontology 36(1):e1031341:1-15 [P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 194130: authorized by Philip Mannion, entered by Philip Mannion on 14.06.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

 Lamniformes - Anacoracidae
Squalicorax kaupi Agassiz 1843 crow shark
 Tselfatiiformes - Plethodidae
Bananogmius sp. Whitley 1940
 Salmoniformes - Enchodontidae
 Acanthomorphata -
"Acanthomorpha indet." = Acanthomorphata
"Acanthomorpha indet." = Acanthomorphata Rosen 1973
 Teleostei -
 Ichthyodectiformes - Saurodontidae
 Ichthyodectiformes - Ichthyodectidae
 Crossognathiformes - Pachyrhizodontidae
Pachyrhizodus minimus Stewart 1899
cf. Apateodus sp. Woodward 1901
 Squamata - Mosasauridae
Mosasauridae indet. Gervais 1852 mosasaur
 Sauropterygia - Polycotylidae
Polycotylus latipinnis Cope 1869 plesiosaur
SDSM 23020