Severn Formation Locality B (Landover) (Cretaceous of the United States)

Also known as McCormick, Inglewood

Where: Prince George's County, Maryland (38.9° N, 76.8° W: paleocoordinates 39.8° N, 52.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithology not reported

• none given

Size classes: macrofossils, mesofossils

Collected by D. J. Bohaska, L. Decina, G. C. Fonger, E. F. Hartstein, P. M. Kranz, & E. M. Lauginiger; reposited in the USNM

Primary reference: D. Baird. 1986. Upper Cretaceous reptiles from the Severn Formation of Maryland. The Mosasaur 3:63-85 [J. Alroy/M. Sommers/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 27563: authorized by John Alroy, entered by John Alroy on 11.12.2002, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Pancheloniidae
Peritresius ornatus Leidy 1856 turtle
USNM 336479, 336470, 336474
 Testudines - Pantrionychidae
cf. Trionyx priscus Cope 1869 turtle
USNM 387367, 336475
 Testudines - Toxochelyidae
Toxochelyidae indet. Baur 1895 sea turtle
USNM 336471; "possibly Peritresius"
 Testudines - Macrobaenidae
Osteopygis emarginatus Cope 1868 turtle
USNM 336472
 Squamata - Mosasauridae
Mosasauridae indet. Gervais 1852 mosasaur
USNM 336473; Lauginiger coll.
Halisaurus platyspondylus Marsh 1869 mosasaur
USNM 336476
"Mosasaurus maximus" = Mosasaurus hoffmannii Mantell 1829 mosasaur
Hartstein coll., tooth
cf. Mosasaurus conodon Cope 1881 mosasaur
USNM 336480, 336473
Prognathodon rapax Hay 1902 mosasaur
USNM 336477
 Crocodylia - Gavialidae
Thoracosaurus neocesariensis De Kay 1842 crocodilian
USNM 336478, 387368; Foniger coll.
 Plesiosauria - Elasmosauridae
cf. Cimoliasaurus magnus Leidy 1851 elasmosaur
Decina coll, cast PU 23625