Sonoma Orogeny

The Sonoma orogeny was a period of mountain building in western North America, which occurred during the Permian / Triassic transition, around 250 million years ago. Following the Late Devonian Antler orogeny, it was the second major accretionary event along the Cordilleran margin with many more to come as the closure of the basin between the island arc of Sonomia and the North American continent. Evidence of this event can be seen throughout western North America, but most distinctly in northwest Nevada.

"To the east of the Sonoma Mountains lay a shallow basin. Sedimentation in the basin buried the earlier Antler orogen. The Sonoma orogeny spelled the end of westward-dipping subduction. Shortly thereafter, east-dipping subduction was initiated, possibly following or concurrently with a period of transform faulting, which truncated the continental margin."

Read more about Sonoma OrogenyStratigraphy, Historical Geology

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Sonoma Orogeny - Historical Geology
... After the Antler orogeny, sedimentation resumed along the passive Cordilleran margin leading to the erosion and burial of the Antler Highlands ...