Browsing Geology by Title
Now showing items 1-20 of 35
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Apatite fission-track evidence for post-collisional exhumation of the Tauern Window, Austrian Alps
(2009-01-01)Ten new apatite fission-track analyses from the Tauern Window, which includes some of the highest peaks in the Austrian Alps, reveal rapid exhumation in the Eastern Alps from 15 to 13 million years ago (Mya). The Alps were ... -
Complex magnetization of a 15.6 my old transitionally-magnetized lava flow: geomagnetic field change during cooling or lightning-induced remagnetization?
(2008-01-01)A paleomagnetic and rock magnetic study of a lava flow (VC 9 in the Sheep Creek range of North Central Nevada) suspected of recording extremely rapid field change demonstrates that its inhomogeneous remanence is more likely ... -
Effects of Plate Boundary Variations on Elevation, Coast Mountains, British Columbia
(2004-01-01)New Geographic Information Systems (GIS) analysis reveals that the width and height of the elevated topography of the Coast Mountains in British Columbia is largely controlled by the type of adjacent plate boundary. This ... -
Effects of Pollution Hotspots, Education and Income on Birthweight in California
(2005-01-01)New Geographic Information Systems (GIS) analysis reveals a correlation between pollution hotspots in California and zones of high percentage of low-birthweight babies. The data reveals that both data sets are spatially ... -
Evidence from the Sheep Creek Range [Nevada] of a Very Rapid Field Change during a Geomagnetic Polarity Reversal
(2002-01-01)Detailed thermal demagnetizations of samples from a 15 million year old lava flow from the Sheep Creek Range in Nevada show that the ancient geomagnetic field direction changed by over 80? during the time it took the flow ... -
Exhumation history of the southern Sierra Nevada mountains from zircon fission track thermochronometry
(2007-01-01)An understanding of the tectonic history of the southern Sierra Nevada Mountains is essential in order to develop better fault models for the two active faults bounding the range. In order to better understand the mechanisms ... -
Geomorphology of Mugu Lagoon 1857 to Present, Ventura County, California
(1999-01-01)Mugu Lagoon is a large and relatively undisturbed estuary located at the mouth of Calleguas Creek on the Ventura County coast. Estuaries are rare in California as a result of high shoreline relief, arid climate, and human ... -
Geothermal Research in Iceland: Implications and Applications to the United States
(2003-01-01)I will be traveling to Reykjavik, Iceland for 5 weeks to learn about their new geothermal technology so that I may apply it to the southwestern United States. I will spend two weeks with the United Nations Geothermal ... -
GIS analysis of cumulative impact indicators in Los Angeles County: regulatory agency vs. community residents
(2009-01-01)For this project, I produced detailed maps showing the location of both air quality hazards and sensitive receptor facilities collected by government agencies and community residents located in seven different areas of Los ... -
Improved Simulation of Lava Flow Cooling Supports Hypothesis of Rapid Transitional Geomagnetic Field Change
(2011-01-01)Results from an improved one-dimensional conductive cooling model confirm the findings of Bogue and Glen (2010) that a partially thermally remagnetized lava flow in the Sheep Creek Transition Zone records a rapid transitional ... -
Is Australia the United States' "Deputy Sheriff?"
(2005-01-01)A lot can be said about Australia: loyal, trusted ally, confidante, and friend. In the post-9/11 world, the long-standing relationship between the U.S and Australia continues to draw closer based upon: the threat of ... -
Lateral Variation in Rock Magnetic Properties and Natural Remanence in a 15 my old Lava Flow, Sheep Creek Range, North Central Nevada
(2006-01-01)A paleomagnetic and rock magnetic survey of two vertical profiles through a basaltic lava flow in the Sheep Creek Range of Northern Nevada showed that magnetic properties of the lava vary laterally. Previous studies of ... -
Magnetic Stratigraphy and Tectonic Rotation of the Lower Miocene Rincon Shale (Saucesian Foraminiferal Stage), Santa Barbara County, California
(1999-01-01)The foraminifera from the Rincon Shale in Ventura and Santa Barbara counties, California, were the original basis for the Saucesian Stage of Kleinpell (1938). The Saucesian was originally correlated with the early Miocene, ... -
Magnetic Stratigraphy of the Eocene-Oligocene Transition in Northwestern Oregon
(1998-01-01)The Keasey Formation in Northwestern Oregon contains one of the most complete geologic records of the Eocene-Oligocene transition in the Pacific Northwest. Samples from this sequence of sedimentary rocks were collected in ... -
Magnetic Stratigraphy of The Madre de Dios Formation (Miocene-Pliocene) in the Peruvian Amazon Basin
(2008-01-01)Deposits from the banks of rivers in the Peruvian Amazon basin have already produced a gomphothere mastodont below an Ar/Ar date of 9.01 Ma, making it significantly older than the closing of the Panamanian land bridge at ... -
Magnetic Stratigraphy of the Miocene Round Mountain Silt and Olcese Sand, Bakersfield, California
(2003-01-01)The Round Mountain Silt and the underlying Olcese Sand, northeast of Bakersfield, California, are famous for their large collection of marine vertebrates from the Sharktooth Hill Bonebed and fossil mollusks from both units. ... -
Magnetic Stratigraphy of the Upper Miocene Montesano Formation, Olympic Peninsula of Washington: Implications for Miocene Molluscan Biostratigraphy
(1999-01-01)The Montesano Formation in the Wishkah River near Aberdeen, WA, was the original basis for the late Miocene "Wishkahan" and "Graysian" molluscan stages of Addicott (1976). Yet the precise age of these formations has long ... -
Magneto Stratigraphy of the Coaledo Formation, Coos Bay, Oregon.
(1999-01-01)The Coaledo Formation, exposed in Coos Bay on the southern coast of Oregon, consists of 6000 feet of deltaic sediments, which filled the forearc basin in the Oregon Coast Ranges. This unit has yielded middle Eocene molluscs ... -
Magnetostratigraphy of the Lower Miocene Sespe-Vaqueros Formations, Santa Ana Mountains, Orange County, California L.L. Donohoo
(1998-01-01)The nonmarine redbeds of the Sespe Formation and the overlying gray marine sandstones of the Vaqueros Formation are widespread in southern California, and in most places yield Eocene and Oligocene mammals and molluscs. ... -
Miocene Basalts from Joshua Tree Show Fault Block Rotation
(2010-01-01)Paleomagnetic study of Miocene basalts collected from a locality 7km north of Desert Center, CA (33.7N, 244.6E) shows that rocks are rotated 46.6? in a clockwise direction, results inconsistent with previous kinematic ...