Cedar Hill, TMM 43209: Middle Turonian, Texas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Mosasauridae
Dallasaurus turneri n. gen., n. sp. Bell and Polcyn 2005
1 specimen
see common names

Geography
Country:United States State/province:Texas County:Dallas
Coordinates: 32.6° North, 97.0° West (view map)
Paleocoordinates:33.0° North, 64.3° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Turonian 10 m.y. bin:Cretaceous 6
Key time interval:Middle Turonian Ammonoid zone: Collignoniceras woollgari
Age range of interval:93.50000 - 89.30000 m.y. ago
Stratigraphy
Formation:Kamp Ranch Limestone
Stratigraphic resolution:formation
Stratigraphy comments: "...less than 20 cm above the Turonian Kamp Ranch limestone, which lies in the Collignoceras woollgari Zone. The ten metres overlying the Kamp Ranch have no reported ammonites and the Prionocyclus percarinatus Zone is not recorded... we consider that the postition of [the] type approximates the Collignoceras woollgari Zone... the absolute age is constrained by the underlying Vasoceras birchbyi Zone (93.40 +or- 0.63) and the overlying Prionocyclus percarinatus Zone (90.51 +or-0.45, each separated from the Collignoceras woollgari Zone by one missing zone. an estimate of ~92 Ma for the first appearance of these primitive mosasauroids is not unreasonable" (Jacobs et al. 2005, p. 262).
Lithology and environment
Primary lithology: "limestone"
Includes fossils?Y
Environment:carbonate indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Associated major elements:all
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Museum repositories:TMM
Metadata
Database number:80888
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:M. Uhen Research group:vertebrate
Created:2008-05-19 12:50:46 Last modified:2019-09-19 21:37:05
Access level:the public Released:2008-05-19 12:50:46
Creative Commons license:CC BY
Reference information

Primary reference:

27206. G. L. Bell and M. J. Polcyn. 2005. Dallasaurus turneri, a new primitive mosasauroid from the Middle Turonian of Texas and comments on the phylogeny of Mosasauridae (Squamata). Netherlands Journal of Geosciences 84(3):177-194 [M. Uhen/M. Uhen]

Secondary references:

38150 L. L. Jacobs, K. Ferguson, and C. Rennison. 2005. Cretaceous d13C stratigraphy and the age of dolichosaurs and early mosasaurs. Netherlands Journal of Geosciences - Geologie en Mijnbouw 84(3):257-268 [R. Benson/R. Benson]