The Sonoma orogeny was a period of mountain building in western North America. The exact age and structure of the Sonoma orogeny is controversial.[1][2][3] 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.[4]
The orogeny was named by Silberling and Roberts, who identified it with the Havallah Formation, originally thought to date to the Pennsylvanian and Permian ages[5] but has since been revised to include rocks of Late Devonian and Mississippian age.[1][6] Some geologists dispute whether convergent plate tectonics produced the Sonoma orogeny.[7]
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The Sonomaorogeny was a period of mountain building in western North America. The exact age and structure of the Sonomaorogeny is controversial. The...
the Antler orogeny and continuing with the Sonomaorogeny and Sevier orogeny and culminating with the Laramide orogeny. The Laramide orogeny alone lasted...
orogenies. Some orogenies encompass more than one continent and may have different names in each, and some very large orogenies include sub-orogenies...
island arcs accreted onto the edge of the ancient Wyoming Craton. The Sonomaorogeny uplifted the ancestral Rocky Mountains in parallel with the diversification...
clear, and it may pre-date the Sonomaorogeny. Other references suspect it appears to have thrust during the Sonomaorogeny. Geology of Nevada Golconda,...
structure named for its proximity to the town of Golconda, Nevada. The Sonomaorogeny was caused by the accretion of the Sonomia microcontinent onto western...
Humboldt orogeny, first recognized in rocks in the Pinon Range in 1977, and Permian-Triassic Sonomaorogeny.[citation needed] During the Sonomo orogeny, the...
Shoo Fly complex by the Sonomaorogeny, which is preserved in roof pendants and country rock inclusions. During the Nevadan orogeny in the Jurassic, extensive...
break up. This occurred before the Sonomaorogeny was active in western North America and during the Alleghanian orogeny in eastern Laurentia and western...
Paleogene. Four orogenies occurred in the Mesozoic in the Western Cordillera: the Sonoma, Nevadan, Sevier, and Laramide. The Nevadan orogeny emplaced the...
against miogeoclinal shelf rocks of the continent during the Antler and Sonomaorogenies. The Sierra El Aliso is composed of assemblages of Paleozoic origin...
massive range of coastal mountains was formed during a period of coastal orogeny, millions of years ago. The Mendocino Range is a component of the California...
the Pilar Formation provided some of the first evidence for the Picuris orogeny. The word tuff is derived from the Italian tufo. Bentonite – Rock type...
Farallon plate to terranes produces the buoyant Shatsky Rise. The Laramide orogeny results from basement uplift more than 1,000 km inland. 72–69 Myr ago the...
east of the coastal mountains thrown up by the Sevier orogeny. The increasing weight of the Sonoma mountains to the west drove subsidence of its foreland...
6 miles (9.7 km) below the surface. Around the same time, the Nevadan orogeny built the Nevadan mountain range (also called the Ancestral Sierra Nevada)...
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