Province Name |
Location |
Incorporated map units/structures
|
Rock Type |
Age |
Period |
Deformation |
Age of Deformation |
Snake River Plain |
NE-SW belt across southern Idaho |
Idavada Volcanics, Yellowstone Volcanics, Basalt, Snake River Basalt, and some Quaternary Sedimentary rocks
|
Volcanic: rhyolite and basalt |
17 Ma-Present |
Miocene to Holocene |
Subsidence, dike intrusion |
Up to Holocene |
Columbia Plateau |
Western edge of Idaho |
Columbia River Basalt |
Volcanic: rhyolite and basalt |
Mainly 16 to 17 Ma, a few later flows |
Middle Miocene |
Uplift and folding |
Late Miocene to Holocene |
Idaho-Wyoming Thrust Belt |
SE Idaho, cut by Snake River Plain |
NW-SE trending thrust faults which cut through mostly Paleozoic & Mesozoic sedimentary rocks |
Sedimentary: sandstone, shale, limestone |
700-150 Ma |
Neoproterozoic, Paleozoic, Triassic, Jurassic |
Thrusting and Folding in Cordilleran Orogenic Belt |
Late Cretaceous |
Northern Thrust Belt |
NE Idaho |
NW-SE trending thrust faults, which cut through Precambrian Sedimentary rocks |
Sedimentary: sandstone, shale, limestone (Belt Supergroup) |
1450-1400 Ma |
Mesoproterozoic |
Thrusting and Folding |
Late Cretaceous |
Basin and Range |
SE Idaho, cut by Snake River Plain |
NW-SE trending faults (normal faults, extensional forces) |
Sedimentary: sandstone, shale, limestone |
700-150 Ma |
Mostly Neoproterozoic and Paleozoic |
Linear Mountain Ranges, broken by normal faults |
10 Ma-Holocene (present) |
Idaho Batholith |
Central & Northern Idaho |
Idaho Batholith, Diorite |
Intrusive igneous: granodiorite and tonalite |
110-60 Ma |
Late Cretaceous |
Paleocene Uplift & Erosion & Basin and Range Extension |
Paleocene (~60-50 Ma) and 10 Ma to present |
Challis Volcanics |
Central Idaho |
Challis Volcanics |
Extrusive Igneous: andesite and dacite, also intrusive pink granite |
52-45 Ma |
Eocene |
Paleogene basin formation and Neogene Basin and Range Extension |
40 Ma-Holocene (present) |
Accreted Terranes |
Eastern edge Central Idaho |
Seven Devils Group |
Exotic Terranes: Paleozoic limestone on top of oceanic volcanic rock, also Jurassic intrusions |
~370-250 Ma, intrusions 150 to 170 Ma intrusions |
Paleozoic and Mesozoic |
Middle Cretaceous accretion of terranes onto western Idaho and Basin and Range Extension |
Mid-Cretaceous (120-100 Ma) and 10 Ma to present |
