San Rafael Group
Group of geological formations exposed in the western US / From Wikipedia, the free encyclopedia
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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.[1]
Quick Facts Type, Underlies ...
San Rafael Group | |
---|---|
Stratigraphic range: Middle Jurassic | |
Type | Group |
Underlies | Morrison Formation |
Overlies | Glen Canyon Group |
Thickness | 490 meters (1,610 ft) |
Lithology | |
Primary | Sandstone |
Other | Mudstone, limestone |
Location | |
Coordinates | 39.174°N 110.466°W / 39.174; -110.466 |
Region | Four Corners |
Country | United States |
Type section | |
Named for | San Rafael Reef |
Named by | Gilluly and Reeside |
Year defined | 1928 |
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