Trachyscaphites spiniger ammonite fauna: Late/Upper Campanian, Texas
collected by J. P. Conlin, W. A. Cobban, R. E. Burkholder
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Diplomoceratidae
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Glyptoxoceras sp.
Spath 1925
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30 specimens | |||||||||
| fragments | ||||||||||
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Cephalopoda
- Ammonitida
- Baculitidae
|
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Baculites ex gr. aquilaensis
Reeside 1927
|
100 specimens | |||||||||
| "group of aquilaensis": "more than 100 fragments" | ||||||||||
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Cephalopoda
- Ammonitida
- Scaphitidae
|
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Scaphites (Scaphites) ex gr. hippocrepis
(DeKay 1828)
|
2 specimens | |||||||||
| recombined as Scaphites hippocrepis | ||||||||||
| "group of hippocrepis": "two small fragments" | ||||||||||
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Trachyscaphites densicostatus n. sp.
Cobban and Kennedy 1992
|
3 specimens | |||||||||
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Trachyscaphites spiniger
(Schlüter 1872)
|
40 specimens | |||||||||
| "Trachyscaphites spiniger spiniger": 18 specimens are fragments | ||||||||||
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Cephalopoda
- Ammonitida
- Pachydiscidae
|
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Pachydiscus (Pachydiscus) paulsoni
(Young 1963)
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36 specimens | |||||||||
| (2 measurements) | ||||||||||
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Eupachydiscus grossouvrei
(Kossmat 1898)
|
1 specimen | |||||||||
| (1 measurement) | ||||||||||
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Cephalopoda
- Ammonitida
- Placenticeratidae
|
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Placenticeras sp.
Meek 1876
|
4 specimens | |||||||||
| fragments | ||||||||||
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Cephalopoda
- Ammonitida
- Collignoniceratidae
|
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Menabites (Delawarella) sp.
Collignon 1948
|
1 specimen | |||||||||
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Menabites (Delawarella) vanuxemi
(Morton 1830)
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2 specimens | |||||||||
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Menabites (Delawarella) delawarensis
(Morton 1830)
|
4 specimens | |||||||||
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Menabites (Delawarella) danei
(Young 1963)
|
12 specimens | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Texas | County: | Fannin |
| Coordinates: | 33.4° North, 96.0° West (view map) | ||||
| Paleocoordinates: | 38.0° North, 67.8° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Late/Upper Campanian | ||
| Age range of interval: | 83.60000 - 72.10000 m.y. ago |
Stratigraphy
| Formation: | Ozan | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "ome 46 m above the base" of the Ozan Formation "lower upper Campanian in a north-west European sense" | |||||
Lithology and environment
| Primary lithology: | glauconitic,phosphatic,shelly/skeletal,green marl |
| Lithology description: "a distinctive glauconitic unit at most a few tens of centimetres thick that overlies a marked omission surface that can be traced widely in the subsurface... a red-weathering, green, glauconitic marl rich in bioclasts. The bed is crowded with black phosphate nodules [containing fossils]" | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,original aragonite |
| Size of fossils: | macrofossils |
| Fragmentation: | frequent |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
| Collectors: | J. P. Conlin, W. A. Cobban, R. E. Burkholder |
| Taxonomic list comments:"bivalves, gastropods and vertebrate debris are the commonest faunal elements" but are not identified many specimens are fragmentary, but this is not indicated consistently and multiple specimens are apparently unlikely to be parts of the same individual | |
Metadata
| Also known as: | USGS Mesozoic locality D10154 | ||
| Database number: | 73635 | ||
| Authorizer: | J. Alroy | Enterer: | J. Alroy |
| Modifier: | J. Alroy | Research group: | marine invertebrate |
| Created: | 2007-06-22 17:51:39 | Last modified: | 2007-06-22 21:08:33 |
| Access level: | the public | Released: | 2007-06-22 17:51:39 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 24688. | W. A. Cobban and W. J. Kennedy. 1992. Campanian Trachyscaphites spiniger ammonite fauna in north-east Texas. Palaeontology 35(1):63-93 [J. Alroy/J. Alroy] |