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PRELIMINARY ISOSTATIC RESIDUAL GRAVITY MAP OF THE NEWFOUNDLAND MOUNTAINS AND EAST PART OF THE WELLS 30' x 60' QUADRANGLES, BOX ELDER COUNTY, UTAH

By: V. E. Langenheim, N.D. Athens, B.A. Churchel, H. Willis, N.E. Knepprath, J. Rosario, J. Roza, S.M. Kraushaar, and C.L. Hardwick

A new isostatic residual gravity map of the Newfoundland Mountains and east of the Wells 30×60 quadrangles of Utah is based on compilation of preexisting data and new data collected by the Utah and U.S. Geological Surveys. Pronounced gravity lows occur over Grouse Creek Valley and locally beneath the Great Salt Lake Desert, indicating significant thickness of low-density Tertiary sedimentary rocks and deposits. Gravity highs coincide with exposures of dense pre-Cenozoic rocks in the Newfoundland, Silver Island, and Little Pigeon Mountains. Gravity values measured on pre-Tertiary basement to the north in the Bovine and Hogup Mountains are as much as 10mGal lower. Steep, linear gravity gradients may define basin-bounding faults concealed along the margins of the Newfoundland, Silver Island, and Little Pigeon Mountains, Lemay Island and the Pilot Range.

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New Geologic Maps of Parts of Utah Valley and Adjacent Areas

The Utah Geological Survey’s newest geologic maps could prove useful in efforts to address geologic hazard and resource issues in Utah County. The maps cover parts of central and southern Utah Valley and surrounding areas.

The maps, each of which covers an area of about 55 square miles, include the Goshen Valley North (Map 230), Lincoln Point (Map 232), Provo (Map 233), Soldiers Pass (Map 235), and West Mountain (Map 234) 7.5’ quadrangles. Collectively, the maps include West Mountain, the southern part of the Lake Mountains, and parts of Goshen and Utah Valleys, as well as parts of the communities of Provo, Springville, Spanish Fork, and Payson.

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M-230
M-232
M-233
M-234
M-235

MAP 240

m-240GEOLOGIC MAP OF THE SAGERS FLAT QUADRANGLES, GRAND COUNTY, UTAH
Hellmut H. Doelling and Paul Kuehne

The Sagers Flat quadrangle is located northeast of Arches National Park in eastern Utah. Exposed strata range from Early Cretaceous Cedar Mountain Formation to Late Cretaceous Mancos Shale. The area overlies the ancestral Paradox basin and is influenced by salt-related folds, including the Salt Valley anticline to the west and Cisco Dome to the east.

CD (2 pl., 1:24,000)

M-240……….$14.95

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