Seven Mile Creek (AMNH) (Cretaceous of the United States)

Also known as L&W locality 30, Locality 17

Where: Niobrara County, Wyoming (43.4° N, 104.4° W: paleocoordinates 50.0° N, 78.6° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Lance Formation, Maastrichtian (72.1 - 66.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; poorly lithified, fine-grained claystone and poorly lithified, fine-grained siltstone

• "soft, fine-grained claystones and siltstones"

Size class: macrofossils

Collected by B. Brown in 1900, 1909; reposited in the AMNH

Collection methods: quarrying, mechanical,

• 14 x 40 ft quarry

Primary reference: H. F. Osborn. 1905. Tyrannosaurus and other Cretaceous carnivorous dinosaurs. Bulletin of the American Museum of Natural History 21(14):259-265 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45878: authorized by Matthew Carrano, entered by Matthew Carrano on 10.12.2004, edited by Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Baenidae
Thescelus insiliens2, "Eubaena latifrons n. sp." = Hayemys latifrons3
Thescelus insiliens2 Hay 1908 turtle
AMNH 1108 (Hay, 1908, pls. 24, 25), an almost complete shell
"Eubaena latifrons n. sp." = Hayemys latifrons3 Hay 1908 turtle
AMNH 6139 (holotype crushed skull)
 Avetheropoda - Tyrannosauridae
"Dynamosaurus imperiosus n. gen. n. sp." = Tyrannosaurus rex
"Dynamosaurus imperiosus n. gen. n. sp." = Tyrannosaurus rex Osborn 1905 tyrant lizard king
AMNH 5866/BMNH R7794; holotype
 Ornithischia - Ankylosauridae
Ankylosaurus magniventris1 Brown 1908 ornithischian
dermal plates, originally part of holotype
 Neornithischia - Ceratopsidae
Triceratops sp.5 Marsh 1889 ceratopsid
frill
 Neornithischia - Iguanodontidae
Iguanodontidae indet.5 Bonaparte 1850 iguanodontid
jaw
 Neornithischia - Hadrosauridae
"Anatosaurus annectens" = Edmontosaurus annectens4
"Anatosaurus annectens" = Edmontosaurus annectens4 Marsh 1892 hadrosaurine
AMNH 5863