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Caribou CountyCaribou County has the forested mountains of the Idaho-Wyoming thrust belt on its eastern side, and the wide Bear Lake and Gem valleys on its west, part of the Basin and Range province. Pleistocene volcanic rocks, mainly basalts, fill the Blackfoot Lava field and much of Gem Valley to the west. China Hat and China Cap are Pleistocene rhyolite domes. Phosphate mining still controls the economy of Caribou County, with active mines operated by Simplot, FMC, Monsanto, and Agrium between Soda Springs and Afton, Wyoming. For more information see geology text from Rocks, Rails and Trails. Also see the Fortsch and Link field trip from "Geologic Guidebook to Eastern Idaho". P.K. Link, 10/02 Additional ReadingRocks Rails and Trails: pages Introduction to the Geology of South & East Idaho Introduction to Geologic Diagrams Geologic cross sections Relations between Geology, Topography and Drainage Systems in Idaho Drainage and mountain range map for eastern Idaho Table of Geologic Events in Southern Idaho Drainage Systems, Rails and Trails Geologic Provinces along the Oregon Trail Rocks of the Eastern Idaho Mountains Southeast Idaho Phosphate Mining The Thrust Belt of Southeastern Idaho Views of Thrust Faults References on Idaho Geology Section 3, History of Eastern Idaho Section 3, Chapter 8 -"Famous Potatoes" Agriculture & Irrigation Montpelier Geology of the Soda Springs Area Section 4, Chapter 11 -Caribou Mountain Area Section 4, Chapter 12 -Gem Valley & Chesterfield |
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Click here to see a correlation of geologic units, and the associated time scale. Click here for a printable version of this map.
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