Sunrise Formation

Sunrise Formation
Stratigraphic range: Hettangian-Sinemurian ~201–191  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Formation
Sub-units	Ferguson Hill & New York Canyon members
Overlies	Gabbs Formation
Lithology
Primary	Limestone
Other	Shale, siltstone, sandstone
Location
Coordinates	38°30′N118°06′W / 38.5°N 118.1°W / 38.5; -118.1
Approximate paleocoordinates	19°30′N56°12′W / 19.5°N 56.2°W / 19.5; -56.2
Region	Nevada
Country	United States
Extent	Gabbs Valley Range
Sunrise Formation (the United States) Show map of the United States Sunrise Formation (Nevada) Show map of Nevada

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]

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

• Agerchlamys boellingi ^[5]
• Jaworskiella siemonmulleri ^[6]
• Trigonia aff. hemisphaerica ^[6]
• Vaugonia cf. vancouverensis ^[6]
• Frenguelliella sp. ^[6]

Echinoids

• Plesiechinus hawkinsi

See also

• List of fossiliferous stratigraphic units in Nevada
• Paleontology in Nevada

References

1. Sunrise Formation at Fossilworks.org
2. Guex, 1995
3. Taylor & Guex, 2021
4. Taylor, 1998
5. Taylor & Guex, 2002
6. Poulton, 1979

Bibliography

• Taylor, D.; Guex, J. (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.; Guex, J. (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 (4): 467–497, Bibcode:1998Geobi..31..467T, doi:10.1016/S0016-6995(98)80120-4
• 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