Abstract
There has been considerable speculation regarding the age of the granitic rocks which outcrop over a large part of Idaho. In the present paper pertinent data in published papers and the results of recent investigations by the writer are summarized. These show that most of the granitic rock belongs to a single mass known as the Idaho batholith and to outliers of it, but that there are also much younger granitic masses in the state. The Idaho batholith is shown to be post-Triassic and pre-Tertiary and probably to have been intruded near the end of the Jurassic. A mass of granite exposed over more than 200 square miles is shown to intrude the Idaho batholith and to be of Miocene or possibly Pliocene age.
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