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[]: 1
[Name]: Big Southern Butte
[Image]:
[Date]: 1976
[Location]: Atomic City43°24′05″N 113°01′26″W / 43.401389°N 113.023889°W / 43.401389; -113.023889 (Big Southern Butte)
[County]: Butte
[Ownership]: federal (Bureau of Land Management)
[Description]: A 2,500 ft Rhyolitic dome that rises over the Eastern Snake River Plain. It illustrates the scope and dimensions of Quaternary volcanism in the western United States. -
[]: 2
[Name]: Big Springs
[Image]:
[Date]: 1980
[Location]: Island Park44°30′01″N 111°15′19″W / 44.500278°N 111.255278°W / 44.500278; -111.255278 (Big Springs)
[County]: Fremont
[Ownership]: federal (Caribou-Targhee National Forest)
[Description]: The only first-magnitude spring in the country that issues forth from rhyolitic lava flows. -
[]: 3
[Name]: Cassia Silent City of Rocks
[Image]:
[Date]: 1974
[Location]: Malta42°04′34″N 113°42′06″W / 42.076026°N 113.701676°W / 42.076026; -113.701676 (City of Rocks)
[County]: Cassia
[Ownership]: federal (City of Rocks National Reserve)
[Description]: Monolithic landforms created by exfoliation processes on exposed massive granite plutons. -
[]: 4
[Name]: Crater Rings
[Image]:
[Date]: 1980
[Location]: Mountain Home43°11′27″N 115°51′35″W / 43.1907°N 115.8597°W / 43.1907; -115.8597 (Crater Rings)
[County]: Elmore
[Ownership]: federal (Morley Nelson Snake River Birds of Prey National Conservation Area)
[Description]: Two adjacent and symmetrical pit craters that are among the few examples of this type of crater in the continental United States. -
[]: 5
[Name]: Great Rift of Idaho
[Image]:
[Date]: 1968
[Location]: Craters of the Moon National Monument and Preserve43°27′42″N 113°33′46″W / 43.46167°N 113.56278°W / 43.46167; -113.56278 (Great Rift)
[County]: Blaine, Minidoka, Power
[Ownership]: federal (Craters of the Moon National Monument and Preserve)
[Description]: A tensional fracture in the Earth's crust. -
[]: 6
[Name]: Hagerman Fauna Sites
[Image]:
[Date]: 1975
[Location]: Hagerman Fossil Beds National Monument42°47′26″N 114°56′41″W / 42.7906°N 114.9448°W / 42.7906; -114.9448 (Hagerman Fossil Beds)
[County]: Twin Falls
[Ownership]: federal (Hagerman Fossil Beds National Monument)
[Description]: Contains the world's richest deposits of Upper Pliocene age terrestrial fossils. -
[]: 7
[Name]: Hell's Half Acre Lava Field
[Image]:
[Date]: 1976
[Location]: Blackfoot43°30′N 112°27′W / 43.5°N 112.45°W / 43.5; -112.45 (Hell's Half Acre Lava Field)
[County]: Bingham, Bonneville
[Ownership]: federal (Bureau of Land Management)
[Description]: Fully exposed pahoehoe lava flow. -
[]: 8
[Name]: Hobo Cedar Grove Botanical Area
[Image]:
[Date]: 1980
[Location]: Shoshone47°05′28″N 116°07′37″W / 47.0911°N 116.127°W / 47.0911; -116.127 (Hobo Grove)
[County]: Shoshone
[Ownership]: federal (St. Joe National Forest)
[Description]: An outstanding example of pristine western red cedar forest. -
[]: 9
[Name]: Menan Buttes
[Image]:
[Date]: 1980
[Location]: Menan43°36′N 111°30′W / 43.6°N 111.5°W / 43.6; -111.5 (Menan Buttes)
[County]: Jefferson, Madison
[Ownership]: federal (Bureau of Land Management)
[Description]: Contains outstanding examples of glass tuff cones, which are found in only a few places in the world. -
[]: 10
[Name]: Niagara Springs
[Image]:
[Date]: 1980
[Location]: Hagerman42°51′28″N 114°52′35″W / 42.85778°N 114.87639°W / 42.85778; -114.87639 (Niagara Springs)
[County]: Gooding
[Ownership]: private
[Description]: Least developed of the large springs discharging into the Snake River from the Snake River plain aquifer system. -
[]: 11
[Name]: Sheep Rock
[Image]:
[Date]: 1976
[Location]: Council45°11′30″N 116°40′17″W / 45.191651°N 116.67132°W / 45.191651; -116.67132 (Sheep Rock)
[County]: Adams
[Ownership]: federal (Payette National Forest)
[Description]: Horizontally layered lavas that represent successive flows on the Columbia River Basalt Plateau.
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