Cedar Hill, TMM 43209: Middle Turonian, Texas
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Mosasauridae
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Dallasaurus turneri n. gen., n. sp.
Bell and Polcyn 2005
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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] |