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Mineral Resources > Online Spatial Data > Geology > by state > Idaho Geology

Geologic units in Oneida county, Idaho

Clastic debris; Quaternary colluvium, fanglomerate, talus, and glacial deposits; upland-valley margins (Quaternary) at surface, covers 4 % of this area

Quaternary colluvium, fanglomerate, and talus plus some glacial debris in upland valleys.

Lithology: alluvium; glacial drift; colluvium

Sandstone, limestone, siltstone, shale, and conglomerate; Lower Permian to Middle Pennsylvanian deltaic turbidites; central Idaho; (Early Permian) at surface, covers < 0.1 % of this area

Lower Permian to Middle Pennsylvanian thrusted, marine detritus of central Idaho.

Lithology: sandstone; limestone; siltstone; conglomerate; shale

Rhyolitic tuffs, ignimbrites, and flows, basaltic flows, conglomerate and marlstone; Pliocene to Miocene volcano-sedimentary deposits; eastern Snake River Plain and southeastern Idaho (Pliocene-Miocene) at surface, covers 0.4 % of this area

Pliocene volcanic units, generally air-fall or pyroclastic in origin; grade into (Tpd).

Lithology: rhyolite; tuff; ignimbrite; tholeiite; conglomerate; marlstone

Tertiary (4) sedimentary rocks in Logan-Huntsville Allochthon (Middle Miocene to Late Pliocene) at surface, covers < 0.1 % of this area

Lithology: mudstone; sandstone

Pennsylvanian and Permian sedimentary rocks in Logan-Huntsville Allochthon (Pennsylvanian to Permian) at surface, covers < 0.1 % of this area

Lithology: sandstone; carbonate

Limestone, arenite, dolostone, chert, siltstone, shale; Upper Paleozoic marine continental-shelf deposits; southeastern Idaho (Late Paleozoic) at surface, covers 26 % of this area

Upper Paleozoic marine sediments in southern Idaho.

Lithology: limestone; arenite; dolostone (dolomite); chert; siltstone; shale

Coralline Limestone, sandstone, siltstone, shale, chert, and phosphorite; Mississippianshallow marine inner continental-shelf deposits; east-central Idaho, central Idaho (Mississippian ) at surface, covers 0.6 % of this area

Mississippian shallow-water coralline limestone interval of southern Idaho.

Lithology: limestone; sandstone; siltstone; shale; chert; phosphorite

Gravel, sand, and silt; Quaternary; alluvium (Quaternary) at surface, covers 0.9 % of this area

Quaternary alluvium; may contain some glacial deposits and colluvium in uplands

Lithology: alluvium; alluvial terrace; floodplain; alluvial fan; colluvium

Dolostone, shale, and chert; Silurian marine inner continental-shelf deposits (Late and Middle Silurian) at surface, covers 0.3 % of this area

Upper and Middle Silurian fossiliferous dolomite; clay, silt and sand near base.

Lithology: dolostone (dolomite); shale; chert

Limestone, sandstone, shale, and chert; Pennsylvanian marine epicontinental-basin deposits; southeastern Idaho (Pennsylvanian) at surface, covers 0.7 % of this area

Pennsylvanian beds; lowermost portion of the southern Idaho sequence (PPNs).

Lithology: limestone; sandstone; shale; chert

Older Quaternary alluvial deposits (Quaternary) at surface, covers < 0.1 % of this area

Lithology: alluvium

Sandstone, conglomerate, siltstone, tuff, claystone, limestone, and diatomite; Pliocene tuffaceous alluvial and lacustrine deposits; Snake River Plain and vicinity, southeastern Idaho (Pliocene ) at surface, covers 13 % of this area

Pliocene stream and lake deposits; may be due to volcanic and block-faulting events.

Lithology: sandstone; conglomerate; siltstone; tuff; claystone; shale; limestone

Silt; Quaternary wind-blown loess; eastern Snake River Plain and Basin and Range provinces (Quaternary) at surface, covers < 0.1 % of this area

Quaternary wind-blown deposits; most commonly a loess mantle east of the Snake Plain.

Lithology: loess

Limestone, dolostone, arenite, shale, and siltstone; Lower Paleozoic marine continental-shelf deposits; southeastern Idaho; (Early Paleozoic) at surface, covers 9 % of this area

Lower Paleozoic marine carbonate and clastic units southeast of the Snake Plain.

Lithology: limestone; dolostone (dolomite); arenite; shale; siltstone

Limestone, sandstone, dolostone, and chert; Permian to Pennsylvanian marine epicontinental-basin deposits; southeastern Idaho; (Early Permian to Early Pennsylvanian) at surface, covers 5 % of this area

Lower Permian to Lower Pennsylvanian chert, limestone, and sandstone of southern Idaho; subdivisions are (Ps, and PNs).

Lithology: limestone; sandstone; dolostone (dolomite); chert; siltstone; shale

Basalt flows, pumice, and tuff; Early Pleistocene to Pliocene basaltic volcanics; Snake River Plain (Early Pleistocene) at surface, covers 1 % of this area

Lower Pleistocene to Pliocene basalts with associated tuffs and volcanic detritus.

Lithology: tholeiite; lava flow; pumice; tuff

Clay, silt, sand, and gravel; Late Pleistocene glacial-lake sediments; Basin and Range province (Late Pleistocene) at surface, covers 30 % of this area

Pleistocene glacial-lake, ponded-water, and shoreline sediments.

Lithology: glaciolacustrine; silt; sand; gravel

Dolostone, limestone, arenite, chert, and conglomerate; Ordovician marine continental-shelf deposits; southeastern Idaho (Ordovician) at surface, covers < 0.1 % of this area

Ordovician marine dolomite, quartzite, and limestone; subdivisions are (Ou and Ol).

Lithology: dolostone (dolomite); limestone; arenite; chert; conglomerate

Quaternary Lake Bonneville deposits (Quaternary) at surface, covers < 0.1 % of this area

Lithology: clay or mud; sand; gravel; silt

Open Water (Holocene) at surface, covers < 0.1 % of this area

Lakes and streams

Lithology: water

Gravel, sand, and silt; Quaternary basin-filling alluvium; Snake River Plain, Basin and Range provinces (Quaternary) at surface, covers 7 % of this area

Quaternary detritus; generally basin-filling deposits of central and southern Idaho.

Lithology: alluvium; alluvial fan; alluvial terrace