Big Bend National Park (west and east parts): Late/Upper Turonian, Texas
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Mosasauridae
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Tylosaurinae indet.
Wiliston 1895
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1 individual | |||||||||
| TMM 43345-1; consists of most of an articulated skull, several cervical and trunk vertebrae, and ribs. A portion of the left side of the snout, including the premaxilla, was lost prior to discovery. | ||||||||||
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Mosasaurinae indet.
Gervais 1853
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3 elements | |||||||||
| TMM 43056-3, TMM 43056-7, TMM 43352-11 | ||||||||||
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Russellosaurina indet.
(Bell 1997)
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8 elements | |||||||||
| TMM 43056-12, TMM 43342-1, TMM 43352-2, TMM 43352-16, TMM 43352-18, TMM 43359-4, TMM 43352-1, TMM 43352-14 | ||||||||||
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Reptilia
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Mosasauroidea indet.
()
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4 elements | |||||||||
| spelled with current rank as Mosasauria | ||||||||||
| TMM 43056-4, TMM-43352-6, TMM- 43352-12, TMM 43352-13 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Texas | County: | Brewster |
| Coordinates: | 29.3° North, 103.6° West (view map) | ||||
| Paleocoordinates: | 31.3° North, 71.8° West | ||||
| Basis of coordinate: | based on political unit | ||||
| Geographic resolution: | local area |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Turonian | 10 m.y. bin: | Cretaceous 6 |
| Key time interval: | Late/Upper Turonian | Other zone: | |
| Age range of interval: | 93.90000 - 89.80000 m.y. ago |
Stratigraphy
| Formation: | Boquillas | Member: | Ernst | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Stratigraphy in text not defined with respect to geographic locality. Same geographical data will be used, and divisions based upon stratigraphic information.
Approximately 85 m (280 ft) above the base of the unit | |||||
Lithology and environment
| Primary lithology: | "limestone" |
| Includes fossils? | Y |
| Lithology description: Based on a section measured at Ernst Tinaja (type section of the Ernst Member) and using high resolution sequence stratigraphic methods, the Cenomanian– Turonian boundary was identified 283 m above the base of the Ernst Member. This occurs 65 cm above the top of a 30 cm bentonite couplet consisting of interbedded yellow, white, and maroon clays. Within this couplet is a thin bed of burrowed silty limestone with a diverse ammonite fauna representing perhaps as much as three Late Cenomanian ammonite zones. At 15 m above the Cenomanian–Turonian boundary is the highest hard limestone bed in this interval. It is 10–15 cm thick, with an undulatory base and iron-stained burrows on top. Its density and profuse borings suggest this bed represents a condensed zone or hardground. Immediately above this begins an 83 m-thick section strongly dominated by thick shale intervals with thin calcarenite beds and numerous, thin bentonite stringers. | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Also known as: | Mosasaur localities | ||
| Database number: | 151425 | ||
| Authorizer: | P. Mannion | Enterer: | J. Tennant | Research group: | vertebrate |
| Created: | 2013-10-01 19:00:02 | Last modified: | 2013-10-01 04:00:02 |
| Access level: | the public | Released: | 2013-10-01 19:00:02 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 48383. | G. L. Bell Jr., K. R. Barnes, and M. J. Polcyn. 2013. Late Cretaceous mosasauroids (Reptilia, Squamata) of the Big bend region in Texas, USA. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 103:571-581 [P. Mannion/J. Tennant/F. Aspromonte] |