Oneida County spans the Utah border west of Interstate highway 15, south of Pocatello. Malad City is the county seat and only town of any size. The county is within the Basin and Range province with north-trending normal faults bounding the east sides of the ranges. The active Wasatch fault extends north of Malad Valley and then bends west to west of Elkhorn Peak.
The Bannock Range contains Neoproterozoic through Ordovician strata which are cut by slow-angle normal faults associated with the Bannock Detachment fault, which formed around 10 Ma. The ranges west of Malad Valley contain mainly upper Paleozoic rocks. The Manning Canyon thrust fault is exposed in a small canyon west of Malad, in the Blue Spring Hills.
Lake Bonneville reached into Malad, Curlew, Pocatello, and Juniper Valleys, along the Idaho-Utah border.
See geology and regional text in Rocks, Rails and Trails.
P.K. Link, 10/02
Rocks Rails and Trails: pages
Introduction to the Geology of South & East Idaho
Introduction to Geologic Diagrams
Geologic cross sections
Relations between Geology, Topography and Drainage Systems in Idaho
Drainage and mountain range map for eastern Idaho
Table of Geologic Events in Southern Idaho
Drainage Systems, Rails and Trails
Geologic Provinces along the Oregon Trail
Rocks of the Eastern Idaho Mountains
The Thrust Belt of Southeastern Idaho
Views of Thrust Faults
Basin and Range Faulting
Lake Bonneville and its Flood
Disposal of Wastes at the Idaho National Engineering & Environmental Laboratory
References on Idaho Geology
Section 3, History of Eastern Idaho
Section 3, Chapter 8 -"Famous Potatoes" Agriculture & Irrigation
Section 4, Chapter 15 -Malad Valley & Country to the West
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