James Calzia (Former Employee)
Science and Products
Earthquakes and faults in southern California (1970-2010) Earthquakes and faults in southern California (1970-2010)
The map depicts both active and inactive faults and earthquakes magnitude 1.5 to 7.3 in southern California (1970–2010). The bathymetry was generated from digital files from the California Department of Fish And Game, Marine Region, Coastal Bathymetry Project. Elevation data are from the U.S. Geological Survey National Elevation Database. Landsat satellite image is from fourteen Landsat...
Earthquakes and faults in the San Francisco Bay area (1970-2003) Earthquakes and faults in the San Francisco Bay area (1970-2003)
The map depicts both active and inactive faults and earthquakes magnitude 1.5 to 7.0 in the greater San Francisco Bay area. Twenty-two earthquakes magnitude 5.0 and greater are indicated on the map and listed chronologically in an accompanying table. The data are compiled from records from 1970-2003. The bathymetry was generated from a digital version of NOAA maps and hydrogeographic...
Mineral resources and resource potential map of the Pyramid Peak Roadless Area, Riverside County, California Mineral resources and resource potential map of the Pyramid Peak Roadless Area, Riverside County, California
The Pyramid Peak Roadless Area is underlain by mid-Cretaceous plutonic rocks (granite, granodiorite, and tonalite) that intrude metasedimentary rocks of the Desert Divide Group. The granodiorite grades eastward into strongly deformed mylonitic rocks mapped as part of the Santa Rosa mylonite zone. Metasedimentary rocks, orthogneiss, and anatexites of the Palm Canyon Complex were displaced...
Filter Total Items: 29
Geology of the Monte Blanco borate deposits, Furnace Creek Wash, Death Valley, California Geology of the Monte Blanco borate deposits, Furnace Creek Wash, Death Valley, California
The Monte Blanco borate deposits are located along the southern margin of Death Valley’s Furnace Creek Wash, south of Twenty Mule Team Canyon road in California. Topographic and geologic mapping by S. Muessig and F.M. Byers, Jr., in 1954 documented these deposits’ geologic settings, geometries, mineralogies, and chemical characteristics. They estimated borate resources at the time to be...
Authors
S.J. Muessig, W.M. Pennell, Jeffrey Knott, James Calzia
Exploring ends of eras in the eastern Mojave Desert: The road log Exploring ends of eras in the eastern Mojave Desert: The road log
No abstract available.
Authors
David M. Miller, G.A. Spaulding, R.E. Reynolds, James Calzia, M.E. Wells, Robert Fleck, S. Baltzer
Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013 Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013
Much has been written about the age and formation of Death Valley, but that is one—if not the last—chapter in the fascinating geologic history of this area. Igneous and sedimentary rocks in the Greenwater Range, one mountain range east of Death Valley, tell an earlier story that overlaps with the formation of Death Valley proper. This early story has been told by scientists who have...
Authors
J.P. Calzia, O.T. Ramo, Robert Jachens, Eugene Smith, Jeffrey Knott
Sonoran Basin and Range Ecoregion: Chapter 30 in Status and trends of land change in the Western United States--1973 to 2000 Sonoran Basin and Range Ecoregion: Chapter 30 in Status and trends of land change in the Western United States--1973 to 2000
The Sonoran Basin and Range Ecoregion covers approximately 116,364 km2 (44,928 mi2) of desert landscape in southeastern California and southwestern Arizona (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). This ecoregion is bounded on the west by the Southern and Central California Chaparral and Oak Woodlands and the Southern California Mountains Ecoregions; on the...
Authors
James Calzia, Tamara Wilson
Klamath Mountains Ecoregion: Chapter 13 in Status and trends of land change in the Western United States--1973 to 2000 Klamath Mountains Ecoregion: Chapter 13 in Status and trends of land change in the Western United States--1973 to 2000
The Klamath Mountains Ecoregion covers approximately 47,791 km2 (18,452 mi2) of the Klamath and Siskiyou Mountains of northern California and southern Oregon (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). The ecoregion is flanked by the Coast Range Ecoregion to the west, the Southern and Central California Chaparral and Oak Woodlands Ecoregion to the south, the...
Authors
Benjamin Sleeter, James Calzia
Miocene rapakivi granites in the southern Death Valley region, California, USA Miocene rapakivi granites in the southern Death Valley region, California, USA
Rapakivi granites in the southern Death Valley region, California, include the 12.4-Ma granite of Kingston Peak, the ca. 10.6-Ma Little Chief stock, and the 9.8-Ma Shoshone pluton. All of these granitic rocks are texturally zoned from a porphyritic rim facies, characterized by rapakivi textures and miarolitic cavities, to an equigranular aplite core. These granites crystallized from...
Authors
James Calzia, O.T. Ramo
Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California
Open-File Report 03-096 contains a digital geologic map database of the Valjean Hills 7.5' quadrangle, San Bernardino County, California that includes: ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 8. 2 coverages of the various elements of the geologic map. A Postscript file to plot the geologic map on a topographic base, and containing a Correlation of...
Authors
J.P. Calzia, Bennie Troxel, Christian Raumann
Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism
Mesozoic granitoid plutons in the southern Death Valley region of southeastern California reveal substantial compositional and isotopic diversity for Mesozoic magmatism in the southwestern US Cordillera. Jurassic plutons of the region are mainly calc-alkaline mafic granodiorites with εNdi of –5 to –16, 87Sr/86Sr i of 0.707–0.726, and 206Pb/204Pb i of 17.5–20.0. Cretaceous granitoids of...
Authors
O.T. Ramo, J.P. Calzia, P.J. Kosunen
Late Cenozoic crustal extension and magmatism, southern Death Valley region, California Late Cenozoic crustal extension and magmatism, southern Death Valley region, California
The late Cenozoic geologic history of the southern Death Valley region is characterized by coeval crustal extension and magamatism. Crustal extension is accommodated by numerous listric and planar normal faults as well as right- and left-lateral strike slip faults. The normal faults sip 30°-50° near the surface and flatten and merge leozoic miogeoclinal rocks; the strike-slip faults act...
Authors
J.P. Calzia, O.T. Ramo
Geologic map of the Kingston Range, southern Death Valley, California Geologic map of the Kingston Range, southern Death Valley, California
No abstract available.
Authors
J.P. Calzia, B.W. Troxel, L.A. Wright, B.C. Burchfiel, G. Davis, M.R. McMackin
Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies
The contrast in density between basin-filling deposits and underlying basement rocks in the Basin and Range province produces a distinctive pattern of gravity anomalies that roughly correlates with basin-and-range topography. This is especially apparent in the Death Valley extended terrane, where minima in residual gravity closely correspond to well-known extensional basins, such as...
Authors
Richard Blakely, Robert Jachens, James Calzia, Victoria Langenheim
Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia
Thirty Early Proterozoic intermediate to silicic metasedimentary and metaigneous rocks in the southern Death Valley region and vicinity show ϵNd values of −1.6 to −6.3 at 1.7 Ga and Nd model ages of 2.1 to 2.6 Ga. These cratonic rocks thus reveal an older signature than so far reported for Nd province 1 of the western United States; as much as 30%–40% of their mass may be Archean crustal...
Authors
J.P. Calzia
Science and Products
Earthquakes and faults in southern California (1970-2010) Earthquakes and faults in southern California (1970-2010)
The map depicts both active and inactive faults and earthquakes magnitude 1.5 to 7.3 in southern California (1970–2010). The bathymetry was generated from digital files from the California Department of Fish And Game, Marine Region, Coastal Bathymetry Project. Elevation data are from the U.S. Geological Survey National Elevation Database. Landsat satellite image is from fourteen Landsat...
Earthquakes and faults in the San Francisco Bay area (1970-2003) Earthquakes and faults in the San Francisco Bay area (1970-2003)
The map depicts both active and inactive faults and earthquakes magnitude 1.5 to 7.0 in the greater San Francisco Bay area. Twenty-two earthquakes magnitude 5.0 and greater are indicated on the map and listed chronologically in an accompanying table. The data are compiled from records from 1970-2003. The bathymetry was generated from a digital version of NOAA maps and hydrogeographic...
Mineral resources and resource potential map of the Pyramid Peak Roadless Area, Riverside County, California Mineral resources and resource potential map of the Pyramid Peak Roadless Area, Riverside County, California
The Pyramid Peak Roadless Area is underlain by mid-Cretaceous plutonic rocks (granite, granodiorite, and tonalite) that intrude metasedimentary rocks of the Desert Divide Group. The granodiorite grades eastward into strongly deformed mylonitic rocks mapped as part of the Santa Rosa mylonite zone. Metasedimentary rocks, orthogneiss, and anatexites of the Palm Canyon Complex were displaced...
Filter Total Items: 29
Geology of the Monte Blanco borate deposits, Furnace Creek Wash, Death Valley, California Geology of the Monte Blanco borate deposits, Furnace Creek Wash, Death Valley, California
The Monte Blanco borate deposits are located along the southern margin of Death Valley’s Furnace Creek Wash, south of Twenty Mule Team Canyon road in California. Topographic and geologic mapping by S. Muessig and F.M. Byers, Jr., in 1954 documented these deposits’ geologic settings, geometries, mineralogies, and chemical characteristics. They estimated borate resources at the time to be...
Authors
S.J. Muessig, W.M. Pennell, Jeffrey Knott, James Calzia
Exploring ends of eras in the eastern Mojave Desert: The road log Exploring ends of eras in the eastern Mojave Desert: The road log
No abstract available.
Authors
David M. Miller, G.A. Spaulding, R.E. Reynolds, James Calzia, M.E. Wells, Robert Fleck, S. Baltzer
Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013 Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013
Much has been written about the age and formation of Death Valley, but that is one—if not the last—chapter in the fascinating geologic history of this area. Igneous and sedimentary rocks in the Greenwater Range, one mountain range east of Death Valley, tell an earlier story that overlaps with the formation of Death Valley proper. This early story has been told by scientists who have...
Authors
J.P. Calzia, O.T. Ramo, Robert Jachens, Eugene Smith, Jeffrey Knott
Sonoran Basin and Range Ecoregion: Chapter 30 in Status and trends of land change in the Western United States--1973 to 2000 Sonoran Basin and Range Ecoregion: Chapter 30 in Status and trends of land change in the Western United States--1973 to 2000
The Sonoran Basin and Range Ecoregion covers approximately 116,364 km2 (44,928 mi2) of desert landscape in southeastern California and southwestern Arizona (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). This ecoregion is bounded on the west by the Southern and Central California Chaparral and Oak Woodlands and the Southern California Mountains Ecoregions; on the...
Authors
James Calzia, Tamara Wilson
Klamath Mountains Ecoregion: Chapter 13 in Status and trends of land change in the Western United States--1973 to 2000 Klamath Mountains Ecoregion: Chapter 13 in Status and trends of land change in the Western United States--1973 to 2000
The Klamath Mountains Ecoregion covers approximately 47,791 km2 (18,452 mi2) of the Klamath and Siskiyou Mountains of northern California and southern Oregon (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). The ecoregion is flanked by the Coast Range Ecoregion to the west, the Southern and Central California Chaparral and Oak Woodlands Ecoregion to the south, the...
Authors
Benjamin Sleeter, James Calzia
Miocene rapakivi granites in the southern Death Valley region, California, USA Miocene rapakivi granites in the southern Death Valley region, California, USA
Rapakivi granites in the southern Death Valley region, California, include the 12.4-Ma granite of Kingston Peak, the ca. 10.6-Ma Little Chief stock, and the 9.8-Ma Shoshone pluton. All of these granitic rocks are texturally zoned from a porphyritic rim facies, characterized by rapakivi textures and miarolitic cavities, to an equigranular aplite core. These granites crystallized from...
Authors
James Calzia, O.T. Ramo
Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California
Open-File Report 03-096 contains a digital geologic map database of the Valjean Hills 7.5' quadrangle, San Bernardino County, California that includes: ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 8. 2 coverages of the various elements of the geologic map. A Postscript file to plot the geologic map on a topographic base, and containing a Correlation of...
Authors
J.P. Calzia, Bennie Troxel, Christian Raumann
Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism
Mesozoic granitoid plutons in the southern Death Valley region of southeastern California reveal substantial compositional and isotopic diversity for Mesozoic magmatism in the southwestern US Cordillera. Jurassic plutons of the region are mainly calc-alkaline mafic granodiorites with εNdi of –5 to –16, 87Sr/86Sr i of 0.707–0.726, and 206Pb/204Pb i of 17.5–20.0. Cretaceous granitoids of...
Authors
O.T. Ramo, J.P. Calzia, P.J. Kosunen
Late Cenozoic crustal extension and magmatism, southern Death Valley region, California Late Cenozoic crustal extension and magmatism, southern Death Valley region, California
The late Cenozoic geologic history of the southern Death Valley region is characterized by coeval crustal extension and magamatism. Crustal extension is accommodated by numerous listric and planar normal faults as well as right- and left-lateral strike slip faults. The normal faults sip 30°-50° near the surface and flatten and merge leozoic miogeoclinal rocks; the strike-slip faults act...
Authors
J.P. Calzia, O.T. Ramo
Geologic map of the Kingston Range, southern Death Valley, California Geologic map of the Kingston Range, southern Death Valley, California
No abstract available.
Authors
J.P. Calzia, B.W. Troxel, L.A. Wright, B.C. Burchfiel, G. Davis, M.R. McMackin
Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies
The contrast in density between basin-filling deposits and underlying basement rocks in the Basin and Range province produces a distinctive pattern of gravity anomalies that roughly correlates with basin-and-range topography. This is especially apparent in the Death Valley extended terrane, where minima in residual gravity closely correspond to well-known extensional basins, such as...
Authors
Richard Blakely, Robert Jachens, James Calzia, Victoria Langenheim
Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia
Thirty Early Proterozoic intermediate to silicic metasedimentary and metaigneous rocks in the southern Death Valley region and vicinity show ϵNd values of −1.6 to −6.3 at 1.7 Ga and Nd model ages of 2.1 to 2.6 Ga. These cratonic rocks thus reveal an older signature than so far reported for Nd province 1 of the western United States; as much as 30%–40% of their mass may be Archean crustal...
Authors
J.P. Calzia