Umpqua- Southern Oregon Region
Posted on: August 19th, 2015 in Historical Marker Details |
Welcome to Southern Oregon
Southern Oregon is a land of great geographic diversity. Here are the more than 250-million-year-old Klamath Mountains in the south, and to the north and uplifted 50-million-year-old ocean floor and overlying sediments, called “Siletzia” by geologists. To the east is crystal clear crater lake nestled in ancient volcanic Mount Mazama, and beyond it are Basin and Range fault block mountains separated by lakes such as Summer Lake, …