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Geologic Units
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![](../geomaps/units/qa.gif) |
Quaternary alluvial deposits |
![](../geomaps/units/qs.gif) |
Quaternary surficial cover, fluveolian
cover on Snake River Plain, alluvial fans (Snake River Group) |
![](../geomaps/units/qbo.gif) |
Lake Bonneville deposits |
![](../geomaps/units/tps.gif) |
Pliocene and Upper Miocene stream and lake
deposits (Salt Lake Formation, Starlight Formation, Idaho Group) |
![](../geomaps/units/ss.gif) |
Silurian sedimentary rocks� |
![](../geomaps/units/os.gif) |
Ordovician sedimentary rocks |
![](../geomaps/units/cs.gif) |
Cambrian sedimentary rocks�� |
![](../geomaps/units/ocz.gif) |
Ordovician, Cambrian, and Neoproterozoic
sedimentary rocks, Bannock and Portneuf Ranges |
![](../geomaps/units/czb.gif) |
Cambrian to Neoproterozoic Brigham Group |