Sunrise Formation
The Sunrise Formation is a geologic formation in Nevada. It preserves fossils dating back to the Hettangian to Sinemurian stages of the Early Jurassic period.[1]
| Sunrise Formation Stratigraphic range: Hettangian-Sinemurian ~201–191 Ma | |
|---|---|
| Type | Formation |
| Sub-units | Ferguson Hill & New York Canyon members |
| Overlies | Gabbs Formation |
| Lithology | |
| Primary | Limestone |
| Other | Shale, siltstone, sandstone |
| Location | |
| Coordinates | 38.5°N 118.1°W |
| Approximate paleocoordinates | 19.5°N 56.2°W |
| Region | Nevada |
| Country |  United States |
| Extent | Gabbs Valley Range |
  Sunrise Formation (the United States)  Sunrise Formation (Nevada) | |
Fossil content
Among others, the following fossils have been reported from the formation:
- Ammonites
- Alsatites proaries[2]
- Arnioceras ritterbushi[3]
- A. sparsum[3]
- Coroniceras involutum[4]
- C. luningense[4]
- Guexiceras profundus[4]
- Tipperoceras mullerense[4]
- Tmaegoceras nudaries[4]
- Bivalves
- Echinoids
- Plesiechinus hawkinsi
References
- Sunrise Formation at Fossilworks.org
- Guex, 1995
- Taylor & Guex, 2021
- Taylor, 1998
- Taylor & Guex, 2002
- Poulton, 1979
Bibliography
- Taylor, D., and J. Guex. 2021. Early Sinemurian ammonoids and biochronology of the Sunrise Formation, New York Canyon, Mineral County, Nevada. New Mexico Museum of Natural History and Science Bulletin 82. 371–391.
- Taylor, D., and J. Guex. 2002. The Triassic/Jurassic System boundary in the John Day Inlier, east-central Oregon. Oregon Geology 64. 3-28.
- Taylor, D.G. 1998. Late Hettangian-early Sinemurian (Jurassic) ammonite biochronology of the western Cordillera, United States. Geobios 31. 467-497.
- Guex, J. 1995. Ammonites hettangiennes de la Gabbs Valley Range (Nevada, USA). Mémoires de Géologie (Lausanne) 27. 1-131.
- Poulton, T. P. 1979. Jurassic Trigoniid Bivalves from Canada and Western United States of America. Geological Survey of Canada Bulletin 282. ..
- Jesionek-Szymanska, W. 1970. On a new pygasterid (Echinoidea) from the Jurassic (middle Lias) of Nevada, U.S.A.. Acta Palaeontologica Polonica 15. 411-419.
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