Question

For the first time, Permian-Triassic Foothills subduction, normal polarity in the Sierra Nevada marks the beginning of A) formation of Sierra Magmatic Arc, Batholith B) formation of the Franciscan Formation C) formation of the Sonoma Orogeny

Answer 1

Answer-

Option C - Formation of Sonoma Orogeny

Sonoma Orogeny was the time of formation of mountains in western north America. It occurred during the Permian- Triassic transition which was around 250 million years ago. The orogeny was named by the founders Silberling and Roberts.