Near Soda Springs in Caribou County, Idaho — The American West (Mountains)
China Hat Geological Site
The dome of molten rock was formed from melted rock within the crust of the Earth. As rock melted, it became less dense than the surrounding rock and rose toward the surface of the Earth. Molten rock reached the surface, forming domes at China Hat, China Cap, and North Cone. Locally on the sides and tops of these cones were eruptions and flows of pumice, a gas-rich spongy rhyolite.
When the forces driving the basalt to the surface subsided, molten lava chambers high in the crust drained back toward the region where it originated. As these chambers emptied, they collapsed producing depressions at the land surface as a can be seen by the broken surface of the Blackfoot Lava Field around China Hat.
This area and other parts of the lava field contain sub-parallel northward trending faults in the basalt lave flows. These reflect extension in an east-west direction, perhaps related to intrusion of the domes. The faults create
Location. 42° 49.163′ N, 111° 33.588′ W. Marker is near Soda Springs, Idaho, in Caribou County. Marker is on State Highway 34 near Blackfoot River Road, on the right when traveling west. Touch for map. Marker is at or near this postal address: 2780 Idaho Highway 34, Soda Springs ID 83276, United States of America.
Other nearby markers. At least 8 other markers are within 12 miles of this marker, measured as the crow flies. Henry-Chester Country Store (approx. 6.3 miles away); Travertine Terraces - World Famous Water (approx. 11.4 miles away); Caribou Mountain (approx. 11½ miles away); "It Roars Like a Mad Dragon" (approx. 11½ miles away); The Springs of Soda Springs (approx. 11½ miles away); George W. and Leah Wallet Gorton (approx. 11½ miles away); Ground Observer Corps National Planning (approx. 11½ miles away); Ground Observation Corps Soda Springs Post (approx. 11½ miles away). Touch for a list and map of all markers in Soda Springs.
Categories. • Natural Features • Paleontology •
Credits. This page was last revised on July 23, 2017. This page originally submitted on July 23, 2017, by Barry Swackhamer of San Jose, California. This page has been viewed 78 times since then and 18 times this year. Photos: 1, 2. submitted on July 23, 2017, by Barry Swackhamer of San Jose, California.