Arising near Crater Lake, the Rogue River flows from the geologically young High Cascades through the somewhat older Western Cascades and then through the more ancient Klamath Mountains.[21] The High Cascades are composed of volcanic rock produced at intervals from about 7.6 million years ago through geologically recent events such as the catastrophic eruption of Mount Mazama in about 5700 BCE. The volcano hurled 12 to 15 cubic miles (50 to 63 km3) of ash into the air, covering much of the western U.S. and Canada with airfall deposits. The volcano’s subsequent collapse formed the caldera of Crater Lake.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
