Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2482
Preliminary geologic maps of the Chittenden, Los Gatos, and Watsonville East quadrangles, California Preliminary geologic maps of the Chittenden, Los Gatos, and Watsonville East quadrangles, California
No abstract available.
Authors
T. W. Dibblee, Earl E. Brabb
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
By
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
Review of Paleozoic rocks of the Klamath Mountains Review of Paleozoic rocks of the Klamath Mountains
No abstract available.
Authors
W. P. Irwin
Plate tectonic history of the Yolla Bolly Junction, northern California: Geological Society of America Guidebook Plate tectonic history of the Yolla Bolly Junction, northern California: Geological Society of America Guidebook
No abstract available.
Authors
M. Clark Blake, A. S. Jayko, D. L. Jones
Radiolarians from pre-Nevadan rocks of the Klamath Mountains, California and Oregon Radiolarians from pre-Nevadan rocks of the Klamath Mountains, California and Oregon
No abstract available.
Authors
W. P. Irwin, D. L. Jones, T.A. Kaplan
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
Aboard the Dimitri Mendeleev—Philippine Sea ophiolites Aboard the Dimitri Mendeleev—Philippine Sea ophiolites
No abstract available.
Authors
R. G. Coleman, W. P. Irwin
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
Ophiolitic terranes of California, Oregon, and Nevada Ophiolitic terranes of California, Oregon, and Nevada
No abstract available.
Authors
W. Porter Irwin