MAP 244

GEOLOGIC MAP OF THE PELICAN POINT QUADRANGLE, UTAH COUNTY, UTAH
Barry J. Solomon, Robert F. Biek, and Scott M. Ritter

This quadrangle is located in central Utah within the eastern Basin and Range Province.  The quadrangle includes the northern part of Utah Lake in western Utah Valley, the northern and northeastern lakeshore, and Pelican Point, extending into Utah Lake from the eastern edge of the Lake Mountains.  Bedrock near Pelican Point includes Mississippian-age sedimentary strata on the eastern limb of the Lake Mountains syncline.  The majority of the quadrangle is covered by Utah Lake, which is underlain by normal faults that form the western boundary of Utah Valley.  Surficial deposits along the lakeshore are primarily associated with lacustrine deposition from Holocene Utah Lake and its precursor, late Pleistocene Lake Bonneville.

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

M-244……….$14.95

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OPEN-FILE REPORT 558

40Ar/39Ar GEOCHRONOLOGY RESULTS FOR THE FURNER RIDGE AND TINTIC MOUNTAIN QUADRANGLES, UTAH
Utah Geological Survey and Nevada Isotope Geochronology Laboratory

This Open-File Report makes available raw analytical data from laboratory procedures completed to determine the age of rock samples collected during geologic investigations funded or partially supported by the Utah Geological Survey (UGS). Table 1 provides the sample numbers and locations. Table 2 provides the rock names and map units from which the samples were collected; see the map references for additional information such as geologic setting, and significance or interpretation of the samples in the context of the area where they were collected.

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M-243DM

M-243DMSURFICIAL GEOLOGIC MAP OF THE SALT LAKE CITY SEGMENT AND PART OF ADJACENT SEGMENTS OF THE WASATCH FAULT ZONE, DAVIS, SALT LAKE, AND UTAH COUNTIES
(digitized from U.S. Geological Survey Miscellaneous Investigation Series map I-2106, 1992)
Stephen F. Personius and William E. Scott

This map shows the surficial deposits and the faults that offset them along the Salt Lake City segment and adjacent parts of the Weber and Provo segments of the Wasatch fault zone in north-central Utah.  The map area includes the central and eastern parts of the Salt Lake Valley, including metropolitan Salt Lake City and its southern suburbs.  Although a major surface-faulting earthquake has not occurred on the Wasatch fault zone since the state was settled in 1847, the geologic record contains abundant evidence of large earthquakes during Holocene and late Pleistocene time.  The size, age, and distribution of fault scarps produced by these prehistoric earthquakes can be used to determine the most likely sites for future earthquakes, and are therefore the principal focus of the map.

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RELATED LINK

Salt Lake County Geologic Hazard Maps

REPORT OF INVESTIGATION 266

RI-266GROUND-WATER SENSITIVITY AND VULNERABILITY TO PESTICIDES, BERYL-ENTERPRISE AREA, IRON WASHINGTON, AND BEAVER COUNTIES, UTAH
Mike Lowe, Janae Wallace, Rich Emerson, Anne Johnson, and Rich Riding

The U.S. Environmental Protection Agency has recommended that states develop Pesticide Management Plans for four agricultural chemicals—alachlor, atrazine, metolachlor, and simazine—herbicides used in Utah in the production of corn and sorghum, and to control weeds and undesired vegetation (such as along right-of-ways or utility substations). This 28-page report and two accompanying plates are intended to be used as part of these Pesticide Management Plans to provide local, state, and federal government agencies and agricultural pesticide users with a base of information concerning sensitivity and vulnerability of agricultural pesticides in the Beryl-Enterprise area, Iron, Washington, and Beaver Counties, Utah.

CD (28 p., 2 pl.)

RI-266………$19.95

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SPECIAL STUDY 130

ss-130PALEOSEISMIC INVESTIGATION OF THE NORTHERN WEBER SEGMENT OF THE WASATCH FAULT ZONE AT THE RICE CREEK TRENCH SITE, NORTH OGDEN, UTAH
Christopher B. DuRoss, Stephen F. Personius, Anthony J. Crone, Greg N. McDonald, David J. Lidke

This report presents new paleoseismic information for the northern Weber segment of the Wasatch fault zone, collected as part of a joint Utah Geological Survey and U.S. Geological Survey fault-trench investigation at Rice Creek. This research, which was partially funded through the National Earthquake Hazards Reduction Program, expands the record of Weber-segment paleoearthquakes into the early Holocene, provides new timing and displacement data for the most recent earthquake, and helps reduce uncertainties in earthquake timing, recurrence, displacement, and vertical slip rate. These results are important for understanding segmentation of the northern Wasatch fault zone and for improving earthquake-hazard evaluations of the region.

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OPEN-FILE REPORT 556

ofr-556INTERIM GEOLOGIC MAP OF THE EPHRAIM 7.5-MINUTE QUADRANGLE, SANPETE COUNTY, UTAH
Hellmut H. Doelling, Paul A. Kuehne, and Douglas A. Sprinkel

The Ephraim quadrangle is located about 140 miles south-southeast of Salt Lake City in Sanpete County in central Utah. A diagonal line, extending NE-SW across the quadrangle, divides Sanpete Valley to the northwest, from the Wasatch Plateau. Sanpete Valley is a structural feature in which the San Pitch River flows south along its west margin. Quaternary fans form a gently sloping surface from the plateau front to the floodplain of the river.

Bedrock units are mostly of early Tertiary age. These include the (ascending) North Horn Formation (1100+ feet thick), Flagstaff Limestone (500–1000 feet thick), Colton Formation (1400+ feet thick), Green River Formation (620+ feet exposed), and the Crazy Hollow Formation (less than 50 feet exposed). Of these, the North Horn Formation may also have some Late Cretaceous strata at the base. The older three units are exposed in the Wasatch Plateau, the other two along the plateau-valley margin.

35 p., 1 pl., scale 1:24,000

OFR-556……… $9.95

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SURVEY NOTES volume 41, number 3

snt41-3GEOLOGIC HAZARDS IN UTAH

This issue contains:

    New Geologic Hazards Mapping in Utah

*Landslide Inventory Mapping in Twelvemile
Canyon, Central Utah
*Second Damaging Y Mountain Rock Fall in
Four Years
*Large Rock Fall Closes Highway Near
Cedar City, Utah
*Logan Landslide
*Teacher’s Corner
*GeoSights: Utah’s belly button, Upheaval Dome
*Glad You Asked: What should you do if you find a fossil?
Can you keep it? Should you report it?
*Energy News: Carbon Dioxide Sequestration Demonstration
Project Underway in Utah!
*Survey News
*New Publications

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PAST ISSUES

OPEN-FILE REPORT 550

ofr-550SNOWMELT-INDUCED GROUND-WATER FLUCTUATIONS IN SELECTED NORTHERN UTAH LANDSLIDES—PRELIMINARY RESULTS FROM THE 2007–08 LANDSLIDE WATER YEAR
Francis X. Ashland

The relationship between ground-water levels and late winter/early spring snowmelt was evaluated at selected northern Utah landslides where ground-water observation wells had previously been installed. The period of investigation between September 2007 and August 2008 was characterized by generally wetter-than-normal conditions in the fall and early winter and subsequent drier-than-normal conditions. Snowfall in early winter resulted in a sustained snowpack that lasted through early 2008 at low elevation and into the spring at higher elevation. Ground-water levels predictably rose with melting snow, but the proportion of the rise attributable to melting of the winter snowpack varied. Peak  ground-water levels consistently followed the onset of snowmelt, and locally occurred subsequent to local snowmelt around the vicinity of the observation well. At some locations, high ground-water levels were sustained for weeks or longer despite dry conditions in the spring and early summer.

print on demand (19 p.)

OFR-550……….$8.95

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OPEN-FILE REPORT 552

WHOLE-ROCK GEOCHEMICAL DATA FOR THE SOLDIERS PASS QUADRANGLE
Eric H. Christiansen

This report makes available raw analytical data from laboratory procedures completed to determine the geochemistry of rock samples collected during geologic mapping partially supported by the Utah Geological Survey (UGS). Additional information about these samples is available in Biek and others (2009) and Christiansen and others (2007). These  data were prepared by Brigham Young University, Department of Geological Sciences, under contract to the UGS. These data are highly technical in nature and proper interpretation requires considerable training in applicable geochemical techniques.

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PUBLIC INFORMATION SERIES 94

pi-94

ROCK-FALL HAZARDS IN UTAH
Jessica Castleton

Rock falls pose a hazard in Utah because we live, work, and recreate in close proximity to mountains and mesas. Large rock fragments and boulders accelerate rapidly when dislodged from cliffs and hillsides and can cause significant damage to homes, property, roadways, and vehicles, as well as loss of life. Recent damaging rock falls in Utah highlight the importance of recognizing this hazard. This 4-page, full color brochure provides more information on the rock fall hazard in Utah, including causes of rock falls, how to recognize the hazard, and what you can do to reduce potential rock fall damage.

4 p. (2 sided) brochure

PI-94……….free

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