P. gibbus Zone, Wheeler Fm., Milllard County, UT - Robison 1999: Delamaran, Utah
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Agnostida
- Peronopsidae
|
|||||||
|
Peronopsis segmenta
Robison 1964
|
|||||||
|
Peronopsis montis
|
|||||||
|
Peronopsis scutalis
|
|||||||
|
Peronopsis interstricta
(White 1874)
|
|||||||
|
Diplorrhina depressa
|
|||||||
|
Agnostida
- Ptychagnostidae
|
|||||||
|
Ptychagnostus intermedius
(Tullberg 1880)
|
|||||||
|
Ptychagnostus gibbus
(Linnarsson 1869)
|
|||||||
|
Agnostida
- Diplagnostidae
|
|||||||
|
Peronopsis acadica
(Hartt 1868)
|
|||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Utah | County: | Millard |
| Coordinates: | 39.5° North, 112.9° West (view map) | ||||
| Paleocoordinates: | 30.7° North, 132.3° West (Wright 2013) | ||||
| Geographic resolution: | local area |
Time
| Period: | Cambrian | ||
| 10 m.y. bin: | Cambrian 3 | ||
| *Period: | Middle Cambrian | *Epoch: | St. David's |
| *International age/stage: | Solvan | *Local age/stage: | Delamaran |
| Key time interval: | Delamaran | Zone: | Ehmaniella |
| Age range of interval: | 511 - 506.5 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Wheeler | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: 300 meter thick formation at this locality and horizontal exposure of 8km, but fossils described from basal 63m. Environment is interpretted to be a marine shelf basin at depths below storm wave-base. | |||||
Lithology and environment
| Primary lithology: | black lithified calcareous "shale" | ||
| Lithology description: monofacial succession of thin, dark laminated calcareous shale. | |||
| Environment: | basinal (carbonate) | Tectonic setting: | passive margin |
Taphonomy
| Degree of concentration: | -lag |
| Spatial orientation: | random |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | field collection,observed (not collected) |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: May represent a shell accumulation due to a sediment lag which was reworked and then lithified | |
| Taxonomic list comments:Only trilobites are described to genus/species level | |
Metadata
| Database number: | 10566 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow | Research group: | marine invertebrate |
| Created: | 2001-05-23 10:27:10 | Last modified: | 2001-08-30 17:52:51 |
| Access level: | the public | Released: | 2001-05-23 10:27:10 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 3906. | R. A. Robison. 1999. Base of Ptychagnostus atabus Zone, candidate stratotype for base of unnamed international series. Laurentia 99: V field conference of the Cambrian Stage Subdivision Working Group, International Subcomission on Cambrian Stratigraphy 15-17 [M. Patzkowsky/P. Borkow] |