Publications
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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 containin
Authors
D. L. Jones, M. C. Blake, E. H. Bailey, R. J. McLaughlin
Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique
K-Ar ages have been determined for sulfide minerals for the first time. The occurrence of adequate amounts of potassium-bearing sulfides with ideal compositions K3Fe10S14 (∼10 wt.% K) and KFe2S3 (∼16 wt.% K) in samples from a mafic alkalic diatreme at Coyote Peak, California, prompted an attempt to date these materials. K3Fe10S14, a massive mineral with conchoidal fracture, gives an age of 29.4 ±
Authors
G.K. Czamanske, M. A. Lanphere, Richard C. Erd, M. C. Blake
Ophiolitic terranes of California, Oregon, and Nevada
No abstract available.
Authors
W. Porter Irwin
Initial report of the geological study of oceanic crust of the Philippine Sea floor
No abstract available.
Authors
A. Peyve
Aboard the Dimitri Mendeleev—Philippine Sea ophiolites
No abstract available.
Authors
R. G. Coleman, W. P. Irwin
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
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 terranes,
Authors
W. P. Irwin, D. L. Jones, E.A. Pessagno
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
No abstract available.
Authors
S.W. Moore, E. E. Brabb, A. Warren
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