Publications
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Preliminary location and age database for invertebrate fossils collected in the San Francisco Bay region, California
Most geologic maps published for central California in the past century have been made without the benefit of microfossils. The age of Cretaceous and Tertiary rocks in the structurally complex sedimentary formations of the Coast Ranges is critical in determining stratigraphic succession and in determining whether the juxtapositon of similar appearing formations means that a fault is present. Since
Authors
John M. Parker, William B. West, William T. Malmborg, Earl E. Brabb
Isotopes and ages in the northern Peninsular Ranges batholith, southern California
Strontium, oxygen and lead isotopic and rubidium-strontium geochronologic studies have been completed on Cretaceous and Jurassic (?) granitic rock samples from the northern Peninsular Ranges batholith in southern California. Many of these samples were collected systematically and studied chemically by A. K. Baird and colleagues (Baird and others, 1979). The distribution of these granitic rocks is
Authors
Ronald W. Kistler, Joseph L. Wooden, Douglas M. Morton
Preliminary geologic map of the Fontana 7.5' quadrangle, Riverside and San Bernardino Counties, California
Open-File Report 03-418 is a digital geologic data set that maps and describes the geology of the Fontana 7.5’ quadrangle, Riverside and San Bernardino Counties, California. The Fontana quadrangle database is one of several 7.5’ quadrangle databases that are being produced by the Southern California Areal Mapping Project (SCAMP). These maps and databases are, in turn, part of the nation-wide digit
Authors
Douglas M. Morton, Kelly R. Bovard
Intrusive rock database for the Digital Geologic Map of Utah
Digital geologic maps offer the promise of rapid and powerful answers to geologic questions using Geographic Information System software (GIS). Using modern GIS and database methods, a specialized derivative map can be easily prepared. An important limitation can be shortcomings in the information provided in the database associated with the digital map, a database which is often based on the lege
Authors
C.J. Nutt, Steve Ludington
What governments are doing to reduce the consequences of landslides
No abstract available.
Authors
E. E. Brabb, D. G. Howell, W. R. Cotton
Origin of the Lisburne Hills–Herald Arch structural belt: Stratigraphic, structural, and fission-track evidence from the Cape Lisburne area, northwestern Alaska
No abstract available.
Authors
Thomas E. Moore, T.A. Dumitru, K.E. Adams, S.N. Witebsky, A. G. Harris
Dinosaurs that did not die: Evidence for Paleocene dinosaurs in the Ojo Alamo Sandstone, San Juan Basin, New Mexico
Palynologic and paleomagnetic data confirm a Paleocene age for the Ojo Alamo Sandstone (and its contained dinosaurs) throughout the San Juan Basin of New Mexico. The recently reported discovery of 34 skeletal elements from a single hadrosaur in the Ojo Alamo provides unequivocal evidence that these bones were not reworked from underlying Cretaceous strata. Geochemical studies of samples from sever
Authors
James E. Fassett, Robert A. Zielinski, James R. Budahn
Isostatic gravity map of the Monterey 30' x 60' quadrangle and adjacent areas, California
The digital dataset consists of one file (monterey_100k.iso) containing 2,385 gravity stations. The file, monterey_100k.iso, contains the principal facts of the gravity stations, with one point coded per line. The format of the data is described below.
Each gravity station has a station name, location (latitude and longitude, NAD27 projection), elevation, and an observed gravity reading. The data
Authors
V. E. Langenheim, S. R. Stiles, R.C. Jachens
Rationale and operational plan to upgrade the U.S. gravity database
A concerted effort is underway to prepare a substantially upgraded digital gravity anomaly database for the United States and to make this data set and associated usage tools available on the internet. This joint effort, spearheaded by the geophysics groups at the National Imagery and Mapping Agency (NIMA), University of Texas at El Paso (UTEP), U.S. Geological Survey (USGS), and National Oceanic
Authors
Thomas G. Hildenbrand, Allen Briesacher, Guy Flanagan, William J. Hinze, A. M. Hittelman, Gordon R. Keller, R. P. Kucks, Donald Plouff, Walter Roest, John Seeley, David A. Stith, Mike Webring
Preliminary report on mercury geochemistry of placer gold dredge tailings, sediments, bedrock, and waters in the Clear Creek restoration area, Shasta County, California
Clear Creek, one of the major tributaries of the upper Sacramento River, drains the eastern Trinity Mountains. Alluvial plain and terrace gravels of lower Clear Creek, at the northwest edge of the Sacramento Valley, contain placer gold that has been mined since the Gold Rush by various methods including dredging. In addition, from the 1950s to the 1980s aggregate-mining operations removed gravel f
Authors
Roger P. Ashley, James J. Rytuba, Ronald Rogers, Boris B. Kotlyar, David Lawler
Rationale and operational plan for a U.S. high-altitude magnetic survey
On August 8, 2002, twenty-one scientists from the federal, private and academic sectors met at a workshop in Denver, Co., to discuss the feasibility of collecting magnetic anomaly data on a Canberra aircraft (Figure 1). The need for this 1-day workshop arose because of an exciting and cost-effective opportunity to collect invaluable magnetic anomaly data during a Canberra mission over the U.S. in
Authors
Thomas G. Hildenbrand, Mario Acuna, Robert E. Bracken, Doug Hardwick, William J. Hinze, Gordon R. Keller, Jeff Phillips, Walter Roest
Shaded relief, topographic slope, and land use planning in the Los Altos Hills area, California - an example of the use of elevation data
No abstract available.
Authors
Suzanna K. Brooks, Arthur H. Lachenbruch, Carl M. Wentworth