UpdatedSat, Apr 3, 2021 at 10:52 am MT
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If you have a geologist in the house, Sunday is their day. (Shutterstock / Triff)
BOISE, ID Approximately 64 to 100 million years ago, Boise was ocean front property. The ocean floor, otherwise known as the Pacific Plate, was being pulled both downward and sideways beneath the land mass, also known as the American Plate. According the Bureau of Land Management, heat and pressure melted the plate material with the lighter magma rising up through the crust. This magma then cooled and crystallized, forming the Idaho Batholith.
For proof of this, Boise hikers need to to nothing more than take a trek along the Upper Hulls Gulch Trailhead. Along the trail, granitic rocks form the backbone of west-central Idaho.