Ninja Turtle locality (Cretaceous of the United States)

Also known as Ekalaka

Where: Carter County, Montana (45.9° N, 104.5° W: paleocoordinates 52.2° N, 78.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• bed-level stratigraphic resolution

Environment/lithology: channel lag; medium-grained, coarse sandstone

• Sandstone unit that coarsens upwards from a medium to medium/coarse sandstone and contains numerous small (<1 cm) clay rip-up clasts

Size class: macrofossils

Primary reference: W. G. Joyce, T. R. Lyson, and S. Williams. 2016. New cranial material of Gilmoremys lancensis (Testudines, Trionychidae) from the Hell Creek Formation of southeastern Montana, U.S.A. Journal of Vertebrate Paleontology 36(6):e1225748:1-10 [P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 189003: authorized by Philip Mannion, entered by Philip Mannion on 26.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Myliobatiformes - Dasyatidae
Myledaphus bipartitus Cope 1876 whiptail stingray
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar
 Testudines - Trionychidae
Gilmoremys lancensis Gilmore 1916 softshell turtle
BMRP 2013.4.214, 2012.4.336, 2013.4.240, 2013.4.241 and 2013.4.239
Trionyx beecheri Hay 1904 softshell turtle
Axestemys sp. Hay 1899 softshell turtle
 Testudines -
Compsemys victa Leidy 1856 turtle
 Testudines - Baenidae
Eubaena cephalica Hay 1904 turtle
Palatobaena cohen Lyson and Joyce 2009 turtle
Neurankylus sp. Lambe 1902 turtle
 Testudines - Nanhsiungchelyidae
Basilemys sp. Hay 1902 turtle
 Saurischia -
Theropoda indet. Marsh 1881 theropod
 Avetheropoda - Caenagnathidae
Anzu sp. Lamanna et al. 2014 chicken from hell
manual claw
 Avetheropoda - Tyrannosauridae
Tyrannosaurus sp. Osborn 1905 tyrant lizard
"teeth and pedal phalanx of juvenile"
 Neornithischia - Ceratopsidae
Triceratops sp. Marsh 1889 ceratopsid
"horn corn of a juvenile"
 Neornithischia - Thescelosauridae
Thescelosaurus sp. Gilmore 1913 ornithischian
"cranial and postcranial material belonging to at least three individuals"
 Crocodylia -
Crocodylia indet. Owen 1842 crocodilian
 Choristodera - Champsosauridae
Champsosauridae indet. Cope 1876 champsosaur
 Fagales - Fagaceae
Leepierceia preartocarpoides