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Chico Martinez Creek area. sketch
Fault-Controlled Hydrocarbon Pathways in the Monterey Formation, California
Crocker Flat Landslide Area, Temblor Range, California
—Idealized sketch of an anticlinal limb shows expected orientation of fract...
Eocene Stratigraphy of Chico Martinez Creek Area, Kern County, California
Stratigraphic Relations of Upper Cretaceous in Great Valley, California
Upper Cretaceous Rocks of Parts of Southwestern Oregon and Northern California
Tectonic, Depositional, and Diagenetic History of Monterey Formation (Miocene), Central San Joaquin Basin, California
Structural Evolution of Southern California: Northern Geosynclinal Basin and Coalinga District (Part of Compilation by Reed and Hollister for AAPG, Dec. 1936)
First report of Oniscidia Mörch, (Neogastropoda, Harpidae) in the northeast Pacific fossil record and paleobiogeographic review of the genus
Cenozoic Ampullinidae and Naticidae ( Mollusca, Gastropoda ) from Patagonia, Argentina
A new mound-building biota from the lower Carboniferous of Alabama
Franciscan-Knoxville Problem
Evaluation of Climatic and Tectonic Imprints In Fluvial Successions of An Early Permian Depositional System (Asselian VrchlabÍ Formation, Krkonoše Piedmont Basin, Czech Republic)
SEG Newsletter 76 (January)
ABSTRACT We will embark on a five-day journey through northern, western, and central Sonora, in which we will see excellent examples of mostly Mesozoic to Cenozoic tectonics, sedimentation, and metallogeny. On Day 1, we will visit the porphyry copper deposit at Ajo, Arizona, and several Pleistocene cinder cones and maar craters in the Pinacate Biosphere Reserve. On Day 2, we will see L- and L-S tectonites at the type locality of the Mojave-Sonora megashear in Sierra Los Tanques, Noche Buena orogenic gold deposit, Ediacaran Gamuza beds in Caborca, and have an overview of the Carnero detachment fault on the south side of Sierra La Gloria. Day 3 will explore faults and related sedimentary and volcanic rocks associated with the late Miocene oblique opening of the Gulf of California rift and visit outcrops that record late Miocene timing constraints for flooding of the Gulf of California seaway, including several localities on southern Isla Tiburón accessible only by boat. Day 4 will visit exposures of Permian sedimentary to Paleogene igneous rocks in Hermosillo (Cerro La Campana); Puerto del Sol detachment fault zone; Aconchi batholith and a hot spring localized on a Basin and Range normal fault; Santa Elena low-sulfidation epithermal gold mine; and the Upper Jurassic Cucurpe Formation. On Day 5, we will visit several exposures of different crustal levels of the Magdalena-Madera metamorphic core complex, including the spectacular stretched pebble conglomerates in Arroyo Amolares.
Abstract Since the comprehensive synthesis on the Argentine–Chilean Andes by Mpodozis & Ramos (1989) , important progress has been made on the stratigraphy, palaeogeographic evolution and tectonic development of the Andean Orogen in Chile. We present here an overview of this evolution considering the new information and interpretations, including some unpublished ideas of the authors. To enable the reader to delve further into the subjects treated here, we accompany the text with abundant references. In the interpretation of the stratigraphic and radioisotopic data we used the timescale of Harland et al. (1989) . During most of its history the continental margin of South America was an active plate margin. The Late Proterozoic to Late Palaeozoic evolution was punctuated by terrane accretion and westward arc migration, and can be described as a ‘collisional history’. Although accretion of some terranes has been documented for the post-Triassic history, the evolution during post-Triassic times is characterized more by the eastward retreat of the continental margin and eastward arc migration, attributed to subduction erosion, and therefore can be described as an ‘erosional history’. The intermediate period, comprising the Late Permian and the Triassic, corresponds to an episode of no, or very slow, subduction activity along the continental margin, during which a totally different palaeogeographic organization was developed and a widely distributed magmatism with essentially different affinities occurred. It is therefore possible to differentiate major stages in the tectonostratigraphic evolution of the Chilean Andes, which can be related to the following episodes of supercontinent evolution: (1) post-Pangaea