Publications
Here you will find publications, reports and articles produced by geology, energy, and mineral scientists. For a comprehensive listing of all USGS publications, click the button below.
Filter Total Items: 1427
Southern hemisphere origin of the Cretaceous Laytonville Limestone of California Southern hemisphere origin of the Cretaceous Laytonville Limestone of California
New paleomagnetic, paleontologic, and stratigraphic data from outcrops of the Laytonville Limestone (101 to 88 million years old) support a Southern Hemisphere orgin. A paleomagnetic megaconglomerate test is statistically significant and suggests magnetization at 14?? ?? 5?? south, predating Late Cretaceous to Eocene (70 to 50 million years ago) accretion. Rapid Kula plate movement or...
Authors
J.A. Tarduno, M. McWilliams, W.V. Sliter, H. E. Cook, M.C. Blake, I. Premoli-Silva
Preliminary geologic map of Santa Cruz County, California Preliminary geologic map of Santa Cruz County, California
No abstract available.
Authors
Earl E. Brabb
Map showing the status of landslide inventory and susceptibility mapping in California Map showing the status of landslide inventory and susceptibility mapping in California
No abstract available.
Authors
Fred Taylor, E. E. Brabb
Relationship of grade, tonnage, and basement lithology in volcanic-hosted epithermal precious-and base-metal quartz-adularia-type districts Relationship of grade, tonnage, and basement lithology in volcanic-hosted epithermal precious-and base-metal quartz-adularia-type districts
Examination of grades, tonnages, and basement rocks for 88 epithermal precious- and base-metal quartz-adularia-type districts in North, Central, and South America, and Japan reveals that the type of basement rock below the mineralized veins is useful for predicting grade and size of deposits. Epithermal districts overlying basement with salt and evaporites, or rocks with trapped sea...
Authors
D.L. Mosier, Donald A. Singer, T. Sato, N.J. Page
Geophysics: A reversal of geomagnetic polarity Geophysics: A reversal of geomagnetic polarity
The detailed behaviour of the geomagnetic field during reversals is documented by palaeomagnetists to constrain models of the geomagnetic dynamo. Reversals are studied by measuring the magnetic remanence preserved in rocks to obtain both the direction and intensity of the ancient magnetic field.
Authors
Edward A. Mankinen
Paleomagnetism and K-Ar ages of volcanic rocks from Long Valley caldera, California Paleomagnetism and K-Ar ages of volcanic rocks from Long Valley caldera, California
Paleomagnetic measurements and K‐Ar age determinations on volcanic rocks from Long Valley caldera, California, have enabled further refinement of eruptive activity within this large silicic volcanic center. K‐Ar age determinations show that postcaldera volcanic eruptions began 0.73 m.y. ago and continued periodically until about 50,000 years ago. The eruptions were not temporally random...
Authors
Edward A. Mankinen, C. Sherman Gromme, G. Brent Dalrymple, Marvin A. Lanphere, Roy A. Bailey
Tectonostratigraphic terranes of northern California Tectonostratigraphic terranes of northern California
No abstract available.
Authors
M. Clark Blake, A. S. Jayko, R. J. McLaughlin
Tectonostratigraphic terranes in southwest Oregon Tectonostratigraphic terranes in southwest Oregon
No abstract available.
Authors
Blake, D.E. Engebretson, A. S. Jayko, J. L. Jones
Book Review: The Encyclopedia for Applied Geology Book Review: The Encyclopedia for Applied Geology
No abstract available.
Authors
E. E. Brabb
Stratigraphy and tectonic significance of the Mesozoic tectonostratigraphic terranes of the Vizcaino Peninsula, Baja California Sur, Mexico Stratigraphy and tectonic significance of the Mesozoic tectonostratigraphic terranes of the Vizcaino Peninsula, Baja California Sur, Mexico
No abstract available.
Authors
Thomas E. Moore
Equivalent radiolarian ages from ophiolitic terranes of Cyprus and Oman Equivalent radiolarian ages from ophiolitic terranes of Cyprus and Oman
Radiolarian biostratigraphy shows that umberiferous strata overlying the Troodos ophiolite in Cyprus are Turonian in age and are thus essentially contemporaneous with similar strata that overlie the Samail ophiolite in Oman. However, this radiolarian age is markedly older than Campanian isotopic ages measured on the underlying rocks of the Troodos ophiolite. The revised age for the...
Authors
Charles D. Blome, William P. Irwin