| |
Name |
Image |
Date |
Location |
County |
Ownership |
Description |
|---|
| 1 |
Big Southern Butte |
 |
000000001976-01-01-00001976 |
Atomic City43°24′05″N 113°01′26″W / 43.401389°N 113.023889°W / 43.401389; -113.023889 (Big Southern Butte) |
Butte |
federal (Bureau of Land Management) |
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 |
Big Springs |
 |
000000001980-01-01-00001980 |
Island Park44°30′01″N 111°15′19″W / 44.500278°N 111.255278°W / 44.500278; -111.255278 (Big Springs) |
Fremont |
federal (Caribou-Targhee National Forest) |
The only first-magnitude spring in the country that issues forth from rhyolitic lava flows. |
| 3 |
Cassia Silent City of Rocks |
 |
000000001974-01-01-00001974 |
Malta42°04′34″N 113°42′06″W / 42.076026°N 113.701676°W / 42.076026; -113.701676 (City of Rocks) |
Cassia |
federal (City of Rocks National Reserve) |
Monolithic landforms created by exfoliation processes on exposed massive granite plutons. |
| 4 |
Crater Rings |
 |
000000001980-01-01-00001980 |
Mountain Home43°11′27″N 115°51′35″W / 43.1907°N 115.8597°W / 43.1907; -115.8597 (Crater Rings) |
Elmore |
federal (Morley Nelson Snake River Birds of Prey National Conservation Area) |
Two adjacent and symmetrical pit craters that are among the few examples of this type of crater in the continental United States. |
| 5 |
Great Rift of Idaho |
 |
000000001968-01-01-00001968 |
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) |
Blaine, Minidoka, Power |
federal (Craters of the Moon National Monument and Preserve) |
A tensional fracture in the Earth's crust. |
| 6 |
Hagerman Fauna Sites |
 |
000000001975-01-01-00001975 |
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) |
Twin Falls |
federal (Hagerman Fossil Beds National Monument) |
Contains the world's richest deposits of Upper Pliocene age terrestrial fossils. |
| 7 |
Hell's Half Acre Lava Field |
 |
000000001976-01-01-00001976 |
Blackfoot43°30′N 112°27′W / 43.5°N 112.45°W / 43.5; -112.45 (Hell's Half Acre Lava Field) |
Bingham, Bonneville |
federal (Bureau of Land Management) |
Fully exposed pahoehoe lava flow. |
| 8 |
Hobo Cedar Grove Botanical Area |
 |
000000001980-01-01-00001980 |
Shoshone47°05′28″N 116°07′37″W / 47.0911°N 116.127°W / 47.0911; -116.127 (Hobo Grove) |
Shoshone |
federal (St. Joe National Forest) |
An outstanding example of pristine western red cedar forest. |
| 9 |
Menan Buttes |
 |
000000001980-01-01-00001980 |
Menan43°36′N 111°30′W / 43.6°N 111.5°W / 43.6; -111.5 (Menan Buttes) |
Jefferson, Madison |
federal (Bureau of Land Management) |
Contains outstanding examples of glass tuff cones, which are found in only a few places in the world. |
| 10 |
Niagara Springs |
 |
000000001980-01-01-00001980 |
Hagerman42°51′28″N 114°52′35″W / 42.85778°N 114.87639°W / 42.85778; -114.87639 (Niagara Springs) |
Gooding |
private |
Least developed of the large springs discharging into the Snake River from the Snake River plain aquifer system. |
| 11 |
Sheep Rock |
 |
000000001976-01-01-00001976 |
Council45°11′30″N 116°40′17″W / 45.191651°N 116.67132°W / 45.191651; -116.67132 (Sheep Rock) |
Adams |
federal (Payette National Forest) |
Horizontally layered lavas that represent successive flows on the Columbia River Basalt Plateau. |
|