Utah Geological Survey

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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Utah Geological Survey

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

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Utah Geological Survey

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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Utah Geological Survey

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.)

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Utah Geological Survey

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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Utah Geological Survey

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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Utah Geological Survey

MAP 241

m-241-insertGEOLOGIC MAP OF THE WHITE HOUSE QUADRANGLE, GRAND COUNTY, UTAH
Hellmut H. Doelling and Paul Kuehne

The White House quadrangle is located northeast of Arches National Park in eastern Utah. Exposed strata range from Late Jurassic Brushy Basin Member of the Morrison Formation to Late Cretaceous Mancos Shale. The quadrangle 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.

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Utah Geological Survey

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.

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Utah Geological Survey

MAP 239

m-239-insertGEOLOGIC MAP OF THE THOMPSON SPRINGS QUADRANGLES, GRAND COUNTY, UTAH
Hellmut H. Doelling and Paul Kuehne

The Thompson Springs quadrangle is located north of Arches National Park in eastern Utah. Exposed strata range from Early Cretaceous Cedar Mountain Formation to Late Cretaceous Castlegate Sandstone. The quadrangle 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.

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Utah Geological Survey

MAP 236

m-2361

GEOLOGIC MAP OF THE CHARLESTON QUADRANGLE, WASATCH COUNTY, UTAH
Robert F. Biek and Mike Lowe

The Charleston quadrangle lies on the south edge of a structural and topographic saddle between the Wasatch Range and Uinta Mountains.  The quadrangle includes the southern part of Heber City and Heber Valley and the northern half of Round Valley, as well as parts of Deer Creek Reservoir and Wasatch Mountain State Park.  The quadrangle also straddles the north edge of the Charleston-Nebo thrust plate, and thus includes three distinct groups of rocks: (1) a nearly complete section of Pennsylvanian rocks of the Oquirrh Formation that comprises the Charleston thrust plate; (2) underlying, southeast-dipping Jurassic and Triassic strata below the Charleston thrust; and (3) Upper Proterozoic, Cambrian, and Mississippian strata that are exposed in a structurally complicated zone between the Charleston thrust and Deer Creek detachment faults.
A variety of late Tertiary and Quaternary deposits record the evolution of the present landscape.

This geologic map and report provide basic geologic information necessary to further evaluate geologic hazards and resources in the area, and to gain an understanding of the geology upon which this landscape developed.

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