 One of the major aspects that changed early during the Coast Range Arc was the status of the northern end of the Farallon Plate, a portion now known as the Kula Plate.About 85 million years ago, the Kula Plate broke off from the Farallon Plate to form an area of seafloor spreading called the Kula-Farallon Ridge.This change apparently had some important ramifications for regional geologic evolution.