||The conterminous United States hosts numerous volumetrically significant and geographically dispersed granitoid intrusions that range in age from 1.50 to 1.32 billion years before present (Ga). Although previously referred to as A-type granites, most are
||du Bray, Edward A.; Holm-Denoma, Christopher S.; Lund, Karen; and Premo, Wayne R.
||U.S. Geological Survey Scientific Investigations Report 2017-5111