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Geologic sightseeing

Learn more about Oregon's geology


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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
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ocated 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

map legendCoastal RangeKlamath MountainsDeschutes-Columbia PlateauBlue MountainsHigh Lava PlainsCascade RangeWillamette ValleyBasin & Range & Owyhee uplandsBasin & Range & Owyhee uplands

Graphic by Elizabeth L. Orr, Geology of Oregon,
available from Nature of the Northwest


map legendaBlue MountainsWillamette ValleyDeschutes-Columbia plateauKlamath MountainsCoast Rangemap legendbCascade MountainsBasin Range & Owyhee uplandsHigh Lava plainsOwyhee UplandsCascade MountainsBasin & Range & Owyhee UplandsHigh Lava PlainsOwyhee UplandsCascade MountainsBasin & Range & Owyhee UplandsHigh Lava PlainsOwyhee UplandsCascade MountainsBasin & Range & Owyhee UplandsHigh Lava PlainsOwyhee UplandsCascade MountainsBasin & Range & Owyhee UplandsHigh Lava PlainsOwyhee Uplands


back to Geology sightseeing


Seastacks
Seastacks along the southern Oregon coast were once part of an underwater reef complex.


Oregon caves
Oregon Caves is actually one cave, about 1,600 feet long carved out of marble.



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800 NE Oregon Street, Suite 965, Portland, OR 97232-2162
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