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Klamath Mountains This province consists of four north-south-trending belts of metamorphic and igneous rocks that formed in an oceanic setting and subsequently collided with the North American continent about 150 million years ago. Complexly folded and faulted rocks are bounded by belts of sparsely vegetated bands of serpentinite. Oregon Caves National Monument lies within an enormous fault-bounded block of marble. The historic gold-rush town of Jacksonville remains today as evidence of the area’s colorful gold-mining history. Oregon Caves National Monument, located in the Siskiyou Mountains of southwest Oregon, 20 miles east of Cave Junction on Highway 46: Carved in a marble block in the Applegate Group of Late Triassic age, the cave features a 75-minute tour of pillars, stalactites, and stalagmites. For information, contact Oregon Caves National Monument, PO Box 128, Cave Junction, OR 97523, phone (541) 592-2631. Links: Oregon Caves Siskiyou National Monument Rogue River National Forest Siskiyou National Forest Klamath National Forest
Graphic by Elizabeth L. Orr, Geology of Oregon, |
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