Egg Mountain, MOR TM-006 (Cretaceous of the United States)

Where: Teton County, Montana (47.8° N, 112.7° W: paleocoordinates 55.6° N, 79.2° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Two Medicine Formation (Montana Group), Judithian (83.5 - 70.6 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; carbonate

Size classes: macrofossils, mesofossils

Collected by F. Tannenbaum, R. Makela, J. Horner in 1978–

Collection methods: quarrying, surface (in situ), mechanical,

Primary reference: Anonymous. 1979. First carnivorous dinosaur eggs found. Science News 116(10):167, 174 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14453: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Matthew Carrano and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

• within "Lithofacies 4," dated at 76.7 Ma (apparently using SCLF AA, but error and method not given): Horner et al. 2001
Insecta
  -
Insecta indet.5 Linnaeus 1758 insect
Mammalia
 Multituberculata - Neoplagiaulacidae
Filikomys primaevus7 Lambe 1902 multituberculate
MOR 302; see also Montellano et al. 2000
 Multituberculata -
Paracimexomys sp.2 Archibald 1982 multituberculate
 Theriamorpha - Alphadontidae
Alphadon halleyi5 Sahni 1972 metatherian
Reptilia
  -
Reptilia indet.5 Laurenti 1768 reptile
 Testudines - Chelydridae
Chelydridae indet.5 Swainson 1839 turtle
 Squamata - Teiidae
Teiidae indet.5 Gray 1827 squamates
 Squamata -
Magnuviator ovimonsensis n. gen. n. sp.3 DeMar et al. 2017 squamates
MOR 6627 - holotype; referred specimen: MOR 7042
 Squamata - Varanidae
Varanidae indet.5 Hardwicke and Gray 1824 monitor lizard
 Dinosauria -
 Ornithischia -
Orodromeus makelai n. gen. n. sp.5
Orodromeus makelai n. gen. n. sp.5 Horner and Weishampel 1988 ornithopod
individuals and egg clutches: includes the type specimen, MOR-294
 Ornithischia - Spheroolithidae
Spheroolithus maiasauroides4 Mikhaillov 1994 ornithopod
UCM 54472
  - Prismatoolithidae
Prismatoolithus levis8 Zelenitsky and Hills 1996 dinosaur
 Theropoda - Troodontidae
Troodon formosus6 Leidy 1856 maniraptoran
parent taxon of P. levis; MOR 299, 393, 675, 963
Troodon cf. formosus5 Leidy 1856 maniraptoran
individuals and egg clutches
 Theropoda - Dromaeosauridae
Dromaeosauridae indet.5 Colbert and Russell 1969 maniraptoran
 Theropoda - Tyrannosauridae
Tyrannosauridae indet.1 Osborn 1906 tyrannosaurid
YPM VPPU 024966, lateral tooth, YPM VPPU (uncatalogued), three teeth