45 km southwest of Jordan (NCD01) (Cretaceous of the United States)

Also known as Acheroraptor temertyorum type

Where: Garfield County County, Montana (47.1° N, 107.4° W: paleocoordinates 53.9° N, 80.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Hell Creek Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• The holotype was found in strata of the Hell Creek Formation (Upper Maastrichtian, Upper Cretaceous)

Environment/lithology: terrestrial; coarse-grained, shelly/skeletal, red sandstone

• The specimen was recovered in situ from a reddish-colored, coarse-grained sandstone containing other small vertebrate fossils and invertebrate shell fragments

Size class: macrofossils

Collected by J. Hudson; reposited in the ROM

Primary reference: D. C. Evans, D. W. Larson, and P. J. Currie. 2013. A new dromaeosaurid (Dinosauria: Theropoda) with Asian affinities from the latest Cretaceous of North America. Naturwissenshaften 100:1041-1049 [R. Benson/R. Benson/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 152397: authorized by Roger Benson, entered by Roger Benson on 20.11.2013, edited by Matthew Carrano, Philip Mannion and Graham Slater

Creative Commons license: CC BY (attribution)

Taxonomic list

• "containing other small vertebrate fossils and invertebrate shell fragments" [not specified]
Reptilia
 Ornithischia - Pachycephalosauridae
Sphaerotholus triregnum n. sp.3 Woodruff et al. 2023 ornithischian
ROM 53583
 Ornithischia -
Pachycephalosaurus wyomingensis2 Gilmore 1931 ornithischian
ROM 53671, 53672, 53665
 Theropoda - Dromaeosauridae
Acheroraptor temertyorum n. gen. n. sp.
Acheroraptor temertyorum n. gen. n. sp. Evans et al. 2013 maniraptoran
ROM 63777, an almost complete right maxilla, missing only the posterior portion of the jugal ramus and an associated maxillary tooth complete with root. Referred specimen: ROM 63778, an almost complete left dentary (missing only the teeth and a small posterior portion of the bone) that may pertain to the same individual as ROM 63777
 Theropoda - Caenagnathidae
cf. Anzu wyliei1 Lamanna et al. 2014 chicken from hell
ROM VP 65884