Rocks, resources and faults; new geological mapping of St. George area

ST. GEORGE – The Utah Geological Survey has published two new geologic maps for the St. George area of Washington County.

The maps will be useful to government officials, land and resource managers, geological consultants, geological engineers, and other interested persons to identify and plan for geologic hazards; identify, develop, and protect geologic resources; and to aid in developing land management strategies. The maps are also a valuable resource for those wishing to better understand the colorful, fascinating landscape of southwestern Utah’s largest urban area.

The “Geologic Map of the St. George 7.5’ Quadrangle” covers approximately 50 square miles of land in and around the City of St. George, extending south to the Arizona border.

The “Geologic Map of the White Hills Quadrangle” covers 50 square miles immediately west of the St. George map and includes the suburb of Bloomington and the upper reaches of the Virgin River Gorge.

Colorful 300 to 190 million-year-old sedimentary rocks, black 2.3 million to 33,000 year-old-basaltic lava flows, and modern unconsolidated sediments are exposed across the mapped areas. as well as those that commonly yield geologic resources such as flagstone, gravel, and gypsum. Also shown are drill holes from past oil and gas exploration efforts and potentially active earthquake faults.

To view the maps in pdf format online:

Geologic Map of the St. George 7.5’ Quadrangle, Washington County, Utah (Map 251DM)

Geologic Map of the White Hills Quadrangle, Washington County, Utah (Map 250DM)

They are also each available as either a printed map for $14.95 or on a DVD (contains GIS database and pdf of map) for $24.95 at the Natural Resources Map & Bookstore, located at 1594 West North Temple, Salt Lake City, by telephoning 801-537-3320 or 888-UTAHMAP, or online at the Utah mapstore website.

Sample portion of Utah Geological Survey Map 251DM (See full map link given in story for details and remainder)

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