The Sonomia terrane is a geologic crustal block known as a "terrane" whose remnants are today centered in northwest Nevada, and extends into western California, southeastern Oregon, and a small sliver of Idaho.
The terrane acquired its name from the Sonoma Range in that region.
The Sonoma orogeny was caused by the accretion of the Sonomia microcontinent onto western North America during the mid-Triassic.
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