Stumpf Site (Level A) (Cretaceous of the United States)

Where: Morton County, North Dakota (46.9° N, 101.5° W: paleocoordinates 52.6° N, 74.4° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Hell Creek Formation (Montana Group), Lancian (70.6 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: fluvial; mudstone

• "fluvial sandstones" but shown in a section as a mudstone

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Collected by J. Hoganson

Collection methods: surface (float), surface (in situ),

Primary reference: J. W. Hoganson, J. M. Campbell, and E. C. Murphy. 1994. Stratigraphy and paleontology of the Cretaceous Hell Creek Formation, Stumpf site, Morton County, North Dakota. Proceedings of the North Dakota Academy of Sciences 48:95 [J. Alroy/J. Alroy/M. Carrano]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 14620: authorized by John Alroy, entered by John Alroy on 15.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Cardiida - Sphaeriidae
Sphaerium sp. Scopoli 1777 fingernail clam
 Unionida - Unionidae
Unionidae indet. Rafinesque 1820 freshwater mussel
Gastropoda
 Architaenioglossa - Viviparidae
Lioplacodes sp. Meek and Hayden 1864 snail
 Basommatophora - Physidae
Physa sp. Draparnaud 1801 pulmonate
Chondrichthyes
 Hybodontiformes - Lonchidiidae
"Lissodus selachos" = Lonchidion selachos
"Lissodus selachos" = Lonchidion selachos Estes 1964 elasmobranch
 Myliobatiformes - Dasyatidae
Myledaphus bipartitus Cope 1876 whiptail stingray
Actinopteri
 Albuliformes - Albulidae
Coriops cf. amnicolus Estes 1969 bonefish
 Amiiformes - Amiidae
"Kindleia fragosa" = Cyclurus fragosus
"Kindleia fragosa" = Cyclurus fragosus Jordan 1927 bowfin
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar
Reptilia
 Testudines - Trionychidae
Trionychidae indet. Gray 1825 softshell turtle
Trionychidae indet.1 Gray 1825 softshell turtle
"Trionyx (Trionyx)"
Trionychinae indet.2 softshell turtle
"Trionyx (Aspideretes)"
 Testudines -
Compsemys victa Leidy 1856 turtle
 Testudines - Pantrionychidae
Helopanoplia distincta Hay 1908 turtle
 Sauria -
 Avetheropoda - Dromaeosauridae
Dromaeosauridae indet. Colbert and Russell 1969 coelurosaur
 Avetheropoda - Tyrannosauridae
Tyrannosauridae indet. Osborn 1906 tyrannosaurid
 Neornithischia - Ceratopsidae
Ceratopsidae indet. Marsh 1888 ceratopsid
 Crocodylia -
"Leidyosuchus sternbergi" = Borealosuchus sternbergii
"Leidyosuchus sternbergi" = Borealosuchus sternbergii Gilmore 1910 crocodilian
 Crocodylia - Alligatoridae
Alligatorinae indet. Cuvier 1807 crocodilian
 Crocodylia -
Brachychampsa cf. montana Gilmore 1911 crocodilian
 Choristodera -
Champsosaurus laramiensis Brown 1905 choristodere
Mammalia
 Multituberculata - Cimolomyidae
Meniscoessus cf. robustus Marsh 1889 multituberculate