Grapevine Lake Dam Spillway (Cretaceous of the United States)

Where: Denton County, Texas (33.0° N, 97.1° W: paleocoordinates 31.4° N, 61.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Conlinoceras tarrantense ammonoid zone, Lewisville Formation (Woodbine Group), Middle Cenomanian (99.6 - 93.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: delta plain; sandstone

• in an overall "coastal marine depositional setting" (presumably meaning that the channel or levee was in a delta plain)
• "near the top of an isolated, sandy channel and levee deposit cut into gray, marine mudstone"

Size class: macrofossils

• "numerous isolated remains"

Collected by K. Howe; reposited in the DMNH

Collection methods: surface (float),

• bones were found "spread out on the surface within centimeters of each other"

Primary reference: R. S. Tykoski and A. R. Fiorillo. 2010. An entantiornithine bird from the lower middle Cenomanian of Texas. Journal of Vertebrate Paleontology 30(1):288-292 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 94333: authorized by John Alroy, entered by John Alroy on 16.02.2010, edited by Matthew Carrano and Eren Tasimov

Creative Commons license: CC BY (attribution)

Taxonomic list

• additional taxa include "sharks, bony fishes, turtles, crocodilians, dinosaurs, and abundant carbonized and petrified wood"
Show authors, comments, and common names
 Tracheophyta -
Tracheophyta indet.
Osteichthyes
 Osteichthyes -
Osteichthyes indet.
Osteichthyes indet. Huxley 1880 bony fish
"bony fishes"
Reptilia
 Theropoda -
Theropoda indet.1, Maniraptora indet.2
Theropoda indet.1 Marsh 1881 theropod
pubis (DMNH 18139)
Maniraptora indet.2 Gauthier 1986 maniraptoran
manual ungual (DMNH 18159)
Aves
 Enantiornithes -
Flexomornis howei n. gen. n. sp.
Flexomornis howei n. gen. n. sp. Tykoski and Fiorillo 2010 bird
Reptilia
 Ornithischia -
Protohadros sp.1, Ampelognathus coheni n. gen. n. sp.3
Protohadros sp.1 Head 1998 ornithopod
juvenile surangular (DMNH 18169)
Ampelognathus coheni n. gen. n. sp.3 Tykoski et al. 2023 ornithopod
Holotype DMNH 2021-05-02, a left dentary (almost complete)
 Loricata -
Crocodyliformes indet.
Crocodyliformes indet. crocodilian
"crocodilians"
 Testudinata -
Testudinata indet.
Testudinata indet. Oppel 1811 turtle
"turtles"
Chondrichthyes
 Selachii -
Selachii indet.
Selachii indet. shark
"sharks"
1Noto 2015; 2Noto et al. 2022; 3Tykoski et al. 2023