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The Virgin River flows westward along the south edge of the quadrangle, exposing only the top of the Permian Queantoweap Sandstone and the Toroweap Formation in the river gorge. The Permian Kaibab Formation covers the southwest third of the quadrangle, and varies in thickness because of subaerial erosion during the time of the major Permian-Triassic unconformity. The Triassic section includes the Moenkopi Formation, which unconformably overlies this paleotopography, and the Chinle Formation. The Jurassic Moenave Formation is poorly exposed in the northwest corner of the quadrangle. Only the south end of the Quaternary Santa Clara basalt flow reached the quadrangle as it flowed down stream drainages from the north. This erosion-resistant basalt is beginning to form an inverted valley. Uplift and downcutting are also documented by incised alluvial-terrace deposits along the Santa Clara and Virgin Rivers and their tributaries. This item is part of a larger digital dataset that contains the additional feature classes, base maps, plates, and other supplementary materials necessary for the user to fully view, evaluate, and utilize the geological spatial data related to this product. A paper version of this map is available from the Utah Department of Natural Resources Map and Bookstore.", "geometryType": "esriGeometryPolyline", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 2.0E-5, "falseX": -20037700, "falseY": -30241100, "xyUnits": 10000, "falseZ": 0, "zUnits": 10000, "falseM": 0, "mUnits": 399999.99999999994 }, "copyrightText": "Program Manager: Grant C. Willis (UGS) \nProject Manager: Robert F. Biek (UGS) \nGIS and Cartography: Jay C. Hill, Kent D. Brown, J. Buck Ehler (UGS) \nGeology review: Grant C. Willis, Robert F. Biek, Michael D. 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