Clayton Ridge [Andrews Mtn Mbr, Campito Fm]: Begadean, Nevada
collected by W. H. Fritz and J. S. Hollingsworth
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Trilobita
- Redlichiida
- Archaeaspididae
|
||||||||||
|
Fritzaspis generalis
Hollingsworth 2007
|
||||||||||
| USNM 534329 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Nevada |
| Coordinates: | 37.8° North, 117.4° West (view map) | ||
| Paleocoordinates: | 9.1° South, 98.8° West | ||
| Basis of coordinate: | stated in text |
Time
| Period: | Cambrian | ||
| 10 m.y. bin: | Cambrian 1-2 | ||
| Key time interval: | Begadean | Trilobite zone: | Fritzaspis |
| Age range of interval: | 538.80000 - 519.90000 m.y. ago |
Stratigraphy
| Formation: | Campito | Member: | Gold Coin | ||
| Stratigraphy comments: uppermost Andrews Mountain Member (up to 90m below the base of Montenegro Mbr) of the Campito Fm. It correlates to the lower Atdabanian.
Hollingsworth (2011) named this the Gold Coin member of the Campito Formation. Fritzaspis zone is Begadean in age. |
Lithology and environment
| Primary lithology: | bioturbation,gray,green lithified sandstone | ||
| Includes fossils? | Y | ||
| Environment: | deep subtidal indet. | Tectonic setting: | passive margin |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection methods: | selective quarrying,surface (float),surface (in situ) |
| Reason for describing collection: | biostratigraphic analysis |
| Collectors: | W. H. Fritz and J. S. Hollingsworth |
| Collection method comments: "The trilobites of the Fritzaspis assemblage are rare and difficult to find, while brachiopods are much more abundant. Over several field sessions, a total of about 200 hours were spent searching this stratigraphic interval to produce a collection of 60 cephala and a few large cephalic fragments. Over 50 hours were spent similarly searching the Andrews Mountain Member below this interval without finding any trilobite material; only trace fossils and two indistinct hyoliths were discovered." | |
Metadata
| Also known as: | Locality 1083 | ||
| Database number: | 90905 | ||
| Authorizer: | A. Lin | Enterer: | A. Lin |
| Modifier: | J. Marcot | Research group: | marine invertebrate |
| Created: | 2009-08-24 19:49:49 | Last modified: | 2022-07-08 12:58:06 |
| Access level: | the public | Released: | 2009-08-24 19:49:49 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 30582. | J. S. Hollingsworth. 2007. Fallotaspidoid trilobite assemblage (Lower Cambrian ) from the Esmeralda Basin (western Nevada, USA): The oldest trilobites from Laurentia. Memoirs of the Association of Australasian Palaeontologists 33:123-140 [A. Lin/A. Lin/M. Hopkins] |