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Year Published: 2014

Paleogeomorphology of the early Colorado River inferred from relationships in Mohave and Cottonwood Valleys, Arizona, California and Nevada

Geologic investigations of late Miocene–early Pliocene deposits in Mohave and Cottonwood valleys provide important insights into the early evolution of the lower Colorado River system. In the latest Miocene these valleys were separate depocenters; the floor of Cottonwood Valley was ∼200 m higher than the floor of Mohave Valley. When Colorado River...

Pearthree, Philip; House, P. Kyle

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Year Published: 2014

Lidar-revised geologic map of the Poverty Bay 7.5' quadrangle, King and Pierce Counties, Washington

For this map, we interpreted a 6-ft-resolution lidar digital elevation model combined with the geology depicted on the Geologic Map of the Poverty Bay 7.5' Quadrangle, King and Pierce Counties, Washington (Booth and others, 2004b). The authors of the 2004 map described, interpreted, and located the geology on the 1:24,000-scale topographic map of...

Tabor, Rowland W.; Booth, Derek B.; Troost, Kathy Goetz
Tabor, R.W., Booth, D.B., and Troost, K.G., 2014, Lidar-revised geologic map of the Poverty Bay 7.5' quadrangle, King and Pierce Counties, Washington: U.S. Geological Survey Scientific Investigations Map 3317, 22 p., scale 1:24,000, http://dx.doi.org/10.3133/sim3317.

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Year Published: 2014

U-Pb zircon age data for selected sedimentary, metasedimentary, and igneous rocks from northern and central Alaska

This publication contains the complete results of U-Pb zircon age dating studies of sedimentary and metasedimentary units from northern and central Alaska that are discussed and interpreted in other reports by the author. Most of the U-Pb ages are of detrital zircons from sandstones, although U-Pb ages from igneous and sedimentary clasts from...

Moore, Thomas E.
Moore, T.E., 2014, U-Pb Zircon Age Data For Selected Sedimentary, Metasedimentary, and Igneous Rocks From Northern and Central Alaska: U.S. Geological Survey Data Series 899, X p., http://dx.doi.org/10.3133/ds899.

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Year Published: 2014

Stochastic modeling of a lava-flow aquifer system

This report describes preliminary three-dimensional geostatistical modeling of a lava-flow aquifer system using a multiple-point geostatistical model. The purpose of this study is to provide a proof-of-concept for this modeling approach. An example of the method is demonstrated using a subset of borehole geologic data and aquifer test data from a...

Cronkite-Ratcliff, Collin; Phelps, Geoffrey A.
Cronkite-Ratcliff, C., and Phelps, G.A., 2014, Stochastic modeling of a lava-flow aquifer system: U.S. Geological Survey Open-File Report 2014-1179, 23 p.

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Year Published: 2014

Deformation from the 1989 Loma Prieta earthquake near the southwest margin of the Santa Clara Valley, California

Damage to pavement and near-surface utility pipes, caused by the 17 October 1989, Loma Prieta earthquake, provides evidence for ground deformation in a 663 km2 area near the southwest margin of the Santa Clara Valley, California (USA). A total of 1427 damage sites, collected from more than 30 sources, are concentrated in four zones, three of which...

Schmidt, Kevin M.; Ellen, Stephen D.; Peterson, David M.

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Year Published: 2014

An 8700 year paleoclimate reconstruction from the southern Maya lowlands

Analysis of a sediment core from Lago Puerto Arturo, a closed basin lake in northern Peten, Guatemala, has provided an ∼8700 cal year record of climate change and human activity in the southern Maya lowlands. Stable isotope, magnetic susceptibility, and pollen analyses were used to reconstruct environmental change in the region....

Wahl, David B.; Byrne, Roger; Anderson, Lysanna
Wahl, D., Byrne, R., & Anderson, L. (2014). An 8700 year paleoclimate reconstruction from the southern Maya lowlands. Quaternary Science Reviews, 103, 19-25.

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Year Published: 2014

MTpy: A Python toolbox for magnetotellurics

We present the software package MTpy that allows handling, processing, and imaging of magnetotelluric (MT) data sets. Written in Python, the code is open source, containing sub-packages and modules for various tasks within the standard MT data processing and handling scheme. Besides the independent definition of classes and functions,...

Krieger, Lars; Peacock, Jared R.

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Year Published: 2014

A geologic and mineral exploration spatial database for the Stillwater Complex, Montana

The Stillwater Complex is a Neoarchean, ultramafic to mafic layered intrusion exposed in the Beartooth Mountains in south-central Montana. This igneous intrusion contains magmatic mineralization that is variably enriched in strategic and critical commodities such as chromium, nickel, and the platinum-group elements. One deposit, the J-M Reef, is...

Zientek, Michael L.; Parks, Heather L.
Zientek, M.L., and Parks, H.L., 2014, A geologic and mineral exploration spatial database for the Stillwater Complex, Montana: U.S. Geological Survey Scientific Investigations Report 2014-5183, XX p., http://dx.doi.org/10.3133/sir20145183.

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Year Published: 2014

Evidence for large-magnitude, post-Eocene extension in the northern Shoshone Range, Nevada, and its implications for Carlin-type gold deposits in the lower plate of the Roberts Mountains allochthon

The northern Shoshone and Toiyabe Ranges in north-central Nevada expose numerous areas of mineralized Paleozoic rock, including major Carlin-type gold deposits at Pipeline and Cortez. Paleozoic rocks in these areas were previously interpreted to have undergone negligible postmineralization extension and tilting, but here we present new data that...

Colgan, Joseph P.; Henry, Christopher D.; John, David A.
Evidence for large-magnitude, post-Eocene extension in the northern Shoshone Range, Nevada, and its implications for Carlin-type gold deposits in the lower plate of the Roberts Mountains allochthon; 2014; Article; Journal; Economic Geology; Colgan, Joseph P.; Henry, Christopher D.; John, David A.

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Year Published: 2014

Evidence for a marine incursion along the lower Colorado River corridor

Foraminiferal assemblages in the stratigraphically lower part of the Bouse Formation in the Blythe Basin indicate marine conditions whereas assemblages in the upper part of the Bouse Formation indicate lacustrine conditions and suggest the presence of a saline lake. Benthic foraminiferal assemblages in the lower part of the Bouse Formation are...

McDougall, Kristin; Martínez, Adriana Yanet Miranda
Evidence for a marine incursion along the lower Colorado River corridor; 2014; Article; Journal; Geosphere; McDougall, Kristin; Martínez, Adriana Yanet Miranda

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Year Published: 2014

Detecting thermally driven cyclic deformation of an exfoliation sheet with lidar and radar

Rock falls from steep, exfoliating cliffs are common in many landscapes. Of the many mechanisms known to trigger rock falls, thermally driven deformation is among the least quantified, despite potentially being a prevalent trigger due to its occurrence at all times of year. Here we present the results of a field-based monitoring program using...

Collins, Brian D.; Stock, Greg M.

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Year Published: 2014

Sediment-hosted stratabound copper assessment of the Neoproterozoic Roan Group, central African copperbelt, Katanga Basin, Democratic Republic of the Congo and Zambia: Chapter T in Global mineral resource assessment

This study estimates the location, quality, and quantity of undiscovered copper in stratabound deposits within the Neoproterozoic Roan Group of the Katanga Basin in the Democratic Republic of the Congo and Zambia. The study area encompasses the Central African Copperbelt, the greatest sediment-hosted copper-cobalt province in the world, containing...

Zientek, Michael L.; Bliss, James D.; Broughton, David W.; Christie, Michael; Denning, Paul; Hayes, Timothy S.; Hitzman, Murray W.; Horton, John D.; Frost-Killian, Susan; Jack, Douglas J.; Master, Sharad; Parks, Heather L.; Taylor, Cliff D.; Wilson, Anna B.; Wintzer, Niki E.; Woodhead, Jon
Sediment-hosted stratabound copper assessment of the Neoproterozoic Roan Group, central African copperbelt, Katanga Basin, Democratic Republic of the Congo and Zambia: Chapter T in Global Mineral Resource Assessment; 2014; SIR; 2010-5090-T; Global Mineral Resource Assessment (Scientific Investigations Report 2010-5090); Zientek, Michael L.; Bliss, James D.; Broughton, David W.; Christie, Michael; Denning, Paul D.; Hayes, Timothy S.; Hitzman, Murray W.; Horton, John D.; Frost-Killian, Susan; Jack, Douglas J.; Master, Sharad; Parks, Heather L.; Taylor, Cliff D.; Wilson, Anna B.; Wintzer, Niki E.; Woodhead, Jon