Sunrise Formation Explained

Sunrise Formation
Type:	Formation
Age:	Hettangian-Sinemurian ~
Period:	Sinemurian
Prilithology:	Limestone
Otherlithology:	Shale, siltstone, sandstone
Region:	Nevada
Coordinates:	38.5°N -118.1°W
Paleocoordinates:	19.5°N -56.2°W
Subunits:	Ferguson Hill & New York Canyon members
Overlies:	Gabbs Formation
Extent:	Gabbs Valley Range

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

Bibliography

Notes and References

1. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayStrata&geological_group=&formation=Sunrise&group_formation_member=Sunrise Sunrise Formation
2. Guex, 1995
3. Taylor & Guex, 2021
4. Taylor, 1998
5. Taylor & Guex, 2002
6. Poulton, 1979