Rise of the Cordilleran infrastructure during the last half of Mesozoic time provided the gravity potential for lateral spreading and overthrust movements. Near the northeastern margin of the Idaho batholith a tectonic block, 100 by 75 km in size, became detached from the infrastructure in the later stages of its evolution and moved more than 25 km east. We suggest that the emplacement of the Boulder batholith is related to the eastward movement of the block of the tectonic suprastructure.

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