USGS D11377, Section 13 [Smoky Hill Shale Mbr, Niobrara Fm]: Late/Upper Coniacian, New Mexico
collected by Scott, Cobban, Merewether, Buckhorn 1984
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Collignoniceratidae
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Protexanites shoshonensis
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Cephalopoda
- Ammonitida
- Baculitidae
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Baculites asper
Morton 1830
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Baculites codyensis
Reeside 1927
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus (Magadiceramus) subquadratus
Schlüter 1887
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| recombined as Magadiceramus subquadratus | ||||||||||
| Includes subspecies: I (M) subquadratus crenelatus, I (M) subquadratus subquadratus | ||||||||||
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Inoceramus (Magadiceramus) aff. soukupi
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | New Mexico | County: | Colfax |
| Coordinates: | 36.3° North, 104.7° West (view map) | ||||
| Paleocoordinates: | 39.4° North, 71.6° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Coniacian | 10 m.y. bin: | Cretaceous 6 |
| Key time interval: | Late/Upper Coniacian | Inoceramid zone: | Magadiceramus subquadratus |
| Age range of interval: | 89.80000 - 86.30000 m.y. ago |
Stratigraphy
| Formation: | Niobrara | Member: | Smoky Hill Shale | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Smoky Hill Shale Mbr of the Niobrara Fm, which regionally overlies the Fort Hays Limestone. AGE: Coniacian, on the basis of inoceramid and ammonite biostratigraphy; Prionocyclus quadratus biozone. STRATIGRAPHIC POSITION: Bed 25, from near top of Smoky Hill Shale in this section, 65 ft above base of sandy unit. PJW: Magadiceramus subquadratus zone is Late Coniacian. | |||||
Lithology and environment
| Primary lithology: | fine,brown,yellow lithified sandstone |
| Secondary lithology: | fine lithified calcareous sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Calcarenite within Sandstone, yellowish brown, fine grained, shaly, in thin lenses rarely more than one inch thick. LITHIFICATION: Lithified, on the basis of figured specimens. | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: Shallow marine siliciclastic environment. | |
Taphonomy
| Modes of preservation: | body,cast,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection | ||
| Reason for describing collection: | general faunal/floral analysis | ||
| Museum repositories: | UNSM | ||
| Collectors: | Scott, Cobban, Merewether, Buckhorn | Collection dates: | 1984 |
| Collection method comments: COLLECTORS: Scott, Cobban, Merewether, and Buckhorn (1984). REPOSITORY: USNM. | |||
| Taxonomic list comments:COVERAGE: Probably not exhaustive, but comprising representative and common bivalves and cephalopods. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature, and identifications to species-level. | |||
Metadata
| Database number: | 82248 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2008-07-25 11:29:35 | Last modified: | 2019-04-23 16:31:08 |
| Access level: | the public | Released: | 2008-07-25 11:29:35 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 27708. | G. R. Scott, W. A. Cobban, and E. A. Merewether. 1986. Stratigraphy of the Upper Cretaceous Niobrara Formation in the Raton basin, New Mexico. New Mexico Bureau of Mines and Mineral Resources Bulletin 115:1-34 [A. Hendy/A. Hendy] |