USGS Mesozoic 18686, east of Tyrone: Late/Upper Cenomanian, Colorado
collected by N.W. Bass; G.R. Scott, W.A. Cobban 1941; 1966
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Cephalopoda
- Ammonitida
- Acanthoceratidae
|
|||||||
|
Sumitomoceras bentonianum
(Cragin 1893)
|
Cobban 1988 | ||||||
|
Pseudocalycoceras angolaense
(Spath 1931)
|
Cobban 1988 | ||||||
|
Eucalycoceras pentagonum
(Jukes-Browne 1896)
|
Cobban 1988 | ||||||
|
Calycoceras naviculare
(Mantell 1822)
|
|||||||
| recombined as Calycoceras (Calycoceras) naviculare | |||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Colorado | County: | Las Animas |
| Coordinates: | 37.4° North, 104.1° West (view map) | ||||
| Paleocoordinates: | 37.2° North, 67.0° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
| Key time interval: | Late/Upper Cenomanian | Ammonoid zone: | Sciponoceras gracile |
| Age range of interval: | 100.50000 - 93.90000 m.y. ago |
Stratigraphy
| Formation: | Greenhorn Limestone | Member: | Bridge Creek Limestone | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Basal bed of Bridge Creek Limestone member. | |||||
Lithology and environment
| Primary lithology: | lithified "limestone" |
| Environment: | carbonate indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | N.W. Bass; G.R. Scott, W.A. Cobban | Collection dates: | 1941; 1966 |
Metadata
| Database number: | 176980 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2016-03-10 22:18:07 | Last modified: | 2016-03-19 11:14:33 |
| Access level: | the public | Released: | 2016-03-10 22:18:07 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 58396. | W. A. Cobban. 1972. New and little-known ammonites from the Upper Cretaceous (Cenomanian and Turonian) of the western interior of the United States. United States Geological Survey Professional Paper 699:1-24 [M. Clapham/M. Clapham/M. Clapham] |
Secondary references:
| 58501 | W. A. Cobban. 1988. Tarrantoceras Stephenson and related ammonoid genera from Cenomanian (Upper Cretaceous) rocks in Texas and the western interior of the United States. United States Geological Survey Professional Paper 1473:1-30 [M. Clapham/M. Clapham] |