Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2532
Map showing saturated thickness of unconsolidated aquifer, southwestern Kansas, January 1975 Map showing saturated thickness of unconsolidated aquifer, southwestern Kansas, January 1975
No abstract available.
Authors
Edwin D. Gutentag, D.H. Lobmeyer, Steven E. Slagle
Distribution and character of upper Mesozoic subduction complexes along the west coast of North America Distribution and character of upper Mesozoic subduction complexes along the west coast of North America
Structurally complex sequences of sedimentary, volcanic, and intrusive igneous rocks characterize a nearly continuous narrow band along the Pacific coast of North America from Baja California, Mexico to southern Alaska. They occur in two modes: (1) as complexly folded but coherent sequences of graywacke and argillite that locally exhibit blueschist-grade metamorphism, and (2) as melanges
Authors
D. L. Jones, M.C. Blake, E. H. Bailey, R. J. McLaughlin
Geomagnetic polarity event recorded at 1.1 m.y. B.P. on Cobb Mountain, Clear Lake volcanic field, California Geomagnetic polarity event recorded at 1.1 m.y. B.P. on Cobb Mountain, Clear Lake volcanic field, California
Paleomagnetic studies show that a normal polarity event within the Matuyama reversed polarity epoch is recorded by one of the volcanic units on Cobb Mountain in northern California. K-Ar age determinations show that this event has an age of 1.12 ± 0.02 m.y. and clearly preceded the Jaramillo normal polarity event. These data provide the first confirmation from a subaerial volcano that a...
Authors
Edward A. Mankinen, J.M. Donnelly, C. S. Grommé
Geomagnetic paleointensities from radiocarbon‐dated lava flows on Hawaii and the question of the Pacific nondipole low Geomagnetic paleointensities from radiocarbon‐dated lava flows on Hawaii and the question of the Pacific nondipole low
Radiocarbon ages have been published for nine basaltic lava flows on the island of Hawaii; the ages range from 2600 to somewhat older than 17,900 years B.P. By using the Thelliers' method in vacuum, geomagnetic paleointensity values were obtained from eight of the lavas; the ninth proved unsuitable. The paleointensities for the four youngest flows (2600–4600 years B.P.) yield virtual...
Authors
Robert S. Coe, Sherman Gromme, Edward A. Mankinen
Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia
No abstract available.
Authors
Robert W. Luce, James R. O’Neil, Robert O. Rye
Aboard the Dimitri Mendeleev—Philippine Sea ophiolites Aboard the Dimitri Mendeleev—Philippine Sea ophiolites
No abstract available.
Authors
R. G. Coleman, W. P. Irwin
Significance of Mesozoic radiolarians from the pre-Nevadan rocks of the southern Klamath Mountains, California Significance of Mesozoic radiolarians from the pre-Nevadan rocks of the southern Klamath Mountains, California
Ribbon cherts and siliceous tuffs of the North Fork and Rattlesnake Creek terranes of the Klamath Mountains yield Mesozoic radiolarians. Rocks of the North Fork terrane were previously considered to be of Paleozoic age and those of the Rattlesnake Creek to be of Paleozoic and Triassic age, on the basis of fossiliferous limestone bodies that are now considered to be exotic blocks. In both...
Authors
W. P. Irwin, D. L. Jones, E.A. Pessagno
Ophiolitic terranes of California, Oregon, and Nevada Ophiolitic terranes of California, Oregon, and Nevada
No abstract available.
Authors
W. Porter Irwin
Eocene and Oligocene planktonic Foraminifera from the upper Butano Sandstone and type San Lorenzo Formation, Santa Cruz Mountains, California Eocene and Oligocene planktonic Foraminifera from the upper Butano Sandstone and type San Lorenzo Formation, Santa Cruz Mountains, California
No abstract available.
Authors
R.Z. Poore, E. E. Brabb
Technique for concentrating nannoplankton from the Tertiary rocks of the California Coast and Peninsular Ranges Technique for concentrating nannoplankton from the Tertiary rocks of the California Coast and Peninsular Ranges
No abstract available.
Authors
S.W. Moore, E. E. Brabb, A. Warren