Flowstone in Oregon Caves

Oregon Caves National Monument is a National Monument in the northern Siskiyou Mountains of southwestern Oregon in the United States. The main part of the 488-acre (197 ha) park, including the marble cave and a visitor center, is located 20 miles (32 km) east of Cave Junction, on Oregon Route 46. A separate visitor center in Cave Junction occupies 4 acres (1.6 ha) of the total. Both parts of the monument, managed by the National Park Service, are in southwestern Josephine County, near the Oregon–California border. The climate is generally mild even at the cave's elevation of about 4,000 feet (1,200 m) above sea level, but icicles can form at the cave entrance, and winter snow sometimes blocks the park highway.

• http://en.wikipedia.org/wiki/Oregon Caves National Monument