The San Rafael Group is a geologic group or collection of related rock formations that is spread across the U.S. states of New Mexico, Arizona, Utah and Colorado. As part of the Colorado Plateau, this group of formations was laid down in the Middle Jurassic during the Bajocian, Bathonian and Callovian stages.
Asterisks (*) indicate usage by the U.S. Geological Survey.
Read more about San Rafael Group: Subunits, History of Investigation, Places Found
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