Interim Geologic Map of the Promontory Point 30' x 60' Quadrangle, Box Elder, Weber, Davis, and Tooele Counties, Utah—Southwest Part, Year 1 (OFR-739)

By: Don Clark

The Promontory Point 30' x 60' quadrangle extends across the central part of Great Salt Lake to the Interstate highway 15 (I-15) corridor in Box Elder, Weber, Davis, and Tooele Counties, northwest Utah. The map area is in the eastern Basin and Range Province and extends from near Lakeside (west) to the northern Wasatch Front—Brigham City to Layton area (east). This map displays the first year of work of a multi-year project to map the geology of the Promontory Point 30' x 60' quadrangle at 1:62,500 scale. Plate 1 also includes the map explanation showing primary sources of geologic mapping, geologic units, unit correlations, lithologic columns, and geologic symbols. A separate booklet contains geologic unit descriptions, acknowledgments, references, figures, and tables.