| Winnemucca Formation | |
|---|---|
| Stratigraphic range: Triassic period | |
| Type | Geologic formation |
| Location | |
| Region | Northwestern Nevada |
| Country | United States |
| Type section | |
| Named for | Chief Winnemucca (Paiute leader) |
The Winnemucca Formation is a Triassic period geologic formation in northwestern Nevada, USA. It is found in the Sonoma Range in Humboldt County. [1]
It preserves fossils dating back to the Triassic period of the Mesozoic Era.
The Sonoma orogeny was a period of mountain building in western North America. The exact age and structure of the Sonoma orogeny is controversial. The orogeny is generally thought to have occurred during the Permian / Triassic transition, around 250 million years ago, following the Late Devonian Antler orogeny. The Sonoma orogeny was one of a sequence of accretionary events along the Cordilleran margin, possibly caused by the closure of the basin between the island arc of Sonomia and the North American continent. Evidence of this event has been reported throughout western North America, but most distinctly in northwest Nevada.
The Jelm Formation is a geologic formation in Wyoming. It preserves fossils dating back to the Triassic period.
The Ely Springs Dolomite is an Ordovician period geologic formation in the Southwestern United States.
The Virgin Formation is a geologic formation in Utah. It preserves fossils dating back to the Triassic period.
The Thaynes Group, Thaynes Formation in older literature, is a geologic group in eastern Idaho, western Wyoming, Utah and eastern Nevada. It includes the Sinbad Formation, Virgin Formation and Shnabkaib Formation. The Thaynes Group is of marine origin. Its formations are interbedded with layers of the non-marine Moenkopi Group.
The Wood Canyon Formation is a geologic formation in the northern Mojave Desert of Inyo County, California and Nye County and Clark County, Nevada.
The Osobb Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period.
The Prida Formation is a geologic formation in northwestern Nevada. It preserves fossils dating back to the Triassic period.
The Priada Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period.
The Augusta Mountain Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period.
The Dun Glen Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period.
The Excelsior Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period.
The Grantsville Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period.
The Hoyt Canyon Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period.
The Luning Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period. The lowermost strata dates to the late Carnian-early Norian boundary.
The Quatsino Limestone is a geologic formation in British Columbia. It preserves fossils dating back to the Triassic period.
The Grès à Voltzia is a geologic formation in France. It preserves fossils dating back to the Triassic period, more specifically the Anisian stage of the Middle Triassic epoch. It represents a lagerstatte that is well known for its palaeoflora, which shares numerous similarities with palaeobotanical assemblages in the Iberian Peninsula.
The Raibl Formation is an Upper Triassic geologic formation in the Northern and Southern Limestone mountain ranges of the Eastern Alps, in Central Europe.
The Golconda Thrust is a major oceanic terrane that was thrust over central and northern Nevada, North America, in possibly sometime between the Late Permian and the late Jurassic. It is considered equivalent to the Tobin thrust fault.
The Fossil Hill Member is a Middle Triassic-aged rock unit. The Fossil Hill unit occurs as a member of both the Prida and Favret formations. It outcrops in multiple locations across Northwestern Nevada including the western Humboldt Range, Tobin Range, Augusta Mountains, and China Mountain. Calcareous shale, mudstone, and black limestones are the most common lithologies present within the unit. The member was named for Fossil Hill, Nevada, a locality within the Humboldt Mountains where large quantities of Anisian-aged marine fossils were discovered in the early 20th century. Fossils are common throughout the Fossil Hill, and the unit is well known for preserving the remains of some of the earliest marine reptiles, including several genera of ichthyosaurs and a pistosaur. Other fossils include bony fish, hybodont sharks, and invertebrates with ceratitid ammonoids being especially abundant.
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