Threadgill Creek section (San Saba Limestone): Trempealeauan, Texas
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda
- Ellesmerocerida
- Balkoceratidae
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Balkoceras gracile n. gen., n. sp.
Flower 1964
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4 specimens | |||||||||
RHF 307 (holotype); 308-310 (paratypes) | ||||||||||
Cephalopoda
- Ellesmerocerida
- Plectronoceratidae
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Plectronoceras exile n. sp.
Flower 1964
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1 specimen | |||||||||
RHF 303 (type) | ||||||||||
Palaeoceras mutabile n. gen., n. sp.
Flower 1954
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6 specimens | |||||||||
2 specimens in the collections of the Bureau of Economic Geology, University of Texas (holotype + paratype); RHF 304-307 (all are hypotypes) | ||||||||||
Palaeoceras undulatum n. sp.
Flower 1964
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3 specimens | |||||||||
RHF 300 (holotype); 301, 302 (paratypes) | ||||||||||
Cephalopoda
- Ellesmerocerida
- Ellesmeroceratidae
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Ectenolites primus n. sp.
Flower 1964
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1 specimen | |||||||||
RHF 298 (type) | ||||||||||
Ectenolites aff. primus
Flower 1964
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1 specimen | |||||||||
RHF 299 | ||||||||||
see common names |
Geography
Country: | United States | State/province: | Texas | County: | Gillespie |
Coordinates: | 30.5° North, 99.1° West (view map) | ||||
Paleocoordinates: | 17.7° South, 95.8° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Geographic resolution: | outcrop |
Time
Period: | Cambrian | Epoch: | Furongian |
10 m.y. bin: | Cambrian 5 | ||
Key time interval: | Trempealeauan | ||
Age range of interval: | 489.2 - 485.4 m.y. ago |
Stratigraphy
Geological group: | Moore Hollow | Formation: | Wilberns | Member: | San Saba Limestone |
Stratigraphic resolution: | member | ||||
Stratigraphy comments: Some of the specimens are said to come "from the cephalopod bed, now closer to 30 feet than 67 feet, the previous estimate, below the top of the San Saba limestone" (p. 31) but other specimens no exact stratigrapic position is given for. "Trempealeauan San Saba limestone" (e.g.,caption of plate 4). The San Saba Limestone belongs to the Wilberns Fm. (e.g. Bridge et al., 1947, Bull. GSA 58). |
Lithology and environment
Primary lithology: | ooidal,shelly/skeletal grainstone | ||
Includes fossils? | Y | ||
Environment: | shallow subtidal indet. | Tectonic setting: | passive margin |
Taphonomy
Modes of preservation: | body,cast,replaced with calcite,replaced with pyrite |
Size of fossils: | macrofossils |
Temporal resolution: | time-averaged |
Spatial resolution: | autochthonous |
Collection methods and comments
Reason for describing collection: | taxonomic analysis |
Museum repositories: | USNM |
Collection method comments: RHF = collection of Rousseau H. Flower, transferred to the Smithsonian Institution/U.S. National Museum (see Wolberg, 1990, J. Paleont. 64(3, 5, 6)) | |
Taxonomic list comments:In explanation of plate 3 the holotype of Balkoceras gracile is said to be no. 311 of the writers collection. In the text (pp. 34, 35) it is said the holotype of B. gracile is no. 307 of the writers colletion, but no. 307 is also said to be one of the hypotype specimens of Palaeoceras mutabile. |
Metadata
Also known as: | Llano Uplift | ||
Database number: | 88784 | ||
Authorizer: | B. Kröger | Enterer: | T. Liebrecht |
Modifier: | T. Liebrecht | Research group: | marine invertebrate |
Created: | 2009-04-20 15:41:10 | Last modified: | 2009-04-26 12:02:22 |
Access level: | the public | Released: | 2009-04-20 15:41:10 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
29768. | R. H. Flower. 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda). State Bureau of Mines and Mineral Resources New Mexico Institute of Mining and Technology, Memoir 12:234 p. [B. Kröger/T. Liebrecht/P. Wagner] |