Sonoma Orogeny - Historical Geology

Historical Geology

After the Antler orogeny, sedimentation resumed along the passive Cordilleran margin leading to the erosion and burial of the Antler Highlands. Subduction complexes were overlain eastward to form the Golconda allochthons. Subduction complexes continued to move toward the Cordilleran continental margin in response to slab rollback beneath a system of active and remnant intraoceanic island arcs now exposed in the eastern Klamath Mountains and northern Sierra Nevada. The offshore island-arc system faced southeast toward the continental margin. The deformed Havallah sequence was thrust over the Antler overlap sequence.

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