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Heretofore the Ignacio quartzite in southwestern Colorado has been thought to be Late Cambrian in age, disconformably overlain by the Elbert formation of Late Devonian age, and everywhere underlain by eroded older rocks. Recent field work suggests that the Ignacio quartzite is Devonian in age, that it forms an essentially continuous depositional sequence with the overlying Elbert formation and Ouray limestone, and that in the Animas River Valley the Ignacio has been intruded by a granite porphyry of Devonian or younger age.
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