Amherst Collection at Mule Creek (Cretaceous of the United States)

Where: Niobrara County, Wyoming (43.3° N, 104.2° W: paleocoordinates 49.2° N, 71.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pierre Shale Formation (Montana Group), Campanian (83.6 - 72.1 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; shale

Size class: macrofossils

Collected by Amherst College in 1903

Primary reference: F. B. Loomis. 1915. A new mosasaur from the Fort Pierre. American Journal of Science 39(233):555-566 [M. Carrano/H. Street]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 105717: authorized by Matthew Carrano, entered by Hallie Street on 24.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Myalinida - Inoceramidae
Inoceramus sagensis clam
var. nebrascensis
Inoceramus crispii clam
var. barbabini
 Pectinida - Entoliidae
 Pectinida - Pectinoidae
 Pectinida - Oxytomidae
Pteria nebrascana Evans and Shumard 1857 scallop
 Ostreida - Pteriidae
Pteria linguiformis pearl oyster
 Cardiida - Veneridae
Callista deweyi venus clam
Callista peplucida venus clam
 Cardiida - Cardiidae
 Protobranchia - Nuculanidae
Nuculana ? equilateralis pointed nut clam
 Protobranchia - Yoldiidae
 Neogastropoda - Fasciolariidae
 Stromboidea - Aporrhaidae
 Vanikoroidea - Vanikoridae
 Basommatophora - Siphonariidae
 Ammonitida - Heteroceratidae
 Carchariniformes - Carcharhinidae
"Corax sp." = Galeocerdo
"Corax sp." = Galeocerdo Müller and Henle 1837 tiger shark
two teeth and three strings of vertebrae
 Heteromi - Stratodontidae
Empo sp. Cope 1872 ray-finned fish
skull bones and vertebrae
 Clupeiformes - Clupeoidei
Portheus sp. Cope 1871 herring
one pair of lower jaws
 Ichthyodectiformes - Saurodontidae
Saurocephalus sp. Harlan 1824
two crushed skulls
 Ichthyodectiformes - Ichthyodectidae
Ichthyodectes sp. Cope 1870
18 strings of vertebrae, portions of the tail, dentale, and maxilla
 Crossognathiformes - Pachyrhizodontidae
Pachyrhizodus sp. Agassiz 1850
 Squamata - Mosasauridae
Platecarpus brachycephalus Loomis 1915 mosasaur
many parts of skeletons
 Sauropterygia - Elasmosauridae
Elasmosaurus sp. Cope 1868 elasmosaur
one paddle and part of a second