Author: Calvin H. StevensPublisher: Pacific Section Society of Economic Paleontologists & Mineralogists
ISBN:
Category : Science
Languages : en
Pages : 72
Book Description
Paleozoic Shelf-to-basin Transition in Owens Valley, California
Author: Calvin H. StevensPublisher: Pacific Section Society of Economic Paleontologists & Mineralogists
ISBN:
Category : Science
Languages : en
Pages : 72
Book Description
The Pennsylvanian-early Permian Bird Spring Carbonate Shelf, Southeastern California
Author: Calvin H. StevensPublisher: Geological Society of America
ISBN: 0813724295
Category : Science
Languages : en
Pages : 90
Book Description
"The Bird Spring Shelf in southeastern California, along with coeval turbidite basins to the west, records a complex history of Pennsylvanian and Early Permian sedimentation, sea-level changes, and deformation along this part of the western North American continental margin. In this work we describe and figure the fusulinids, including several new species, and establish detailed correlations between deposits of the shelf and the flanking basins. We then use these correlations to reconstruct the depositional history, paleogeography, and deformational history of the region. This work adds significant detail to existing interpretations of the late Paleozoic as a time of major tectonic instability on the continental margin of southeastern California as it changed from a relatively passive margin, which had persisted through most of the Paleozoic, to an active convergent margin that would characterize the Mesozoic."--Publisher's website.
Ordovician from the Andes
Author: Early Paleozoic Continental Shelf to Basin Transition, Northern Virginia
Author: Eugene K. RaderPublisher: American Geophysical Union
ISBN: 9780875905549
Category : Science
Languages : en
Pages : 0
Book Description
Published by the American Geophysical Union as part of the Field Trip Guidebooks Series, Volume 221. The Ordovician transition from a passive-margin, as interpreted from the Beekmantown Group rocks. to foreland-basin deposition behind an active-margin. as interpreted from New Market Limestone through Martinsburg Formation rocks. can be observed in four exposed sections in northern Virginia (Figure 1). A major regional unconformity at the top of Beekmantown Group marks the transition from carbonate deposition on a passive-margin shelf beneath the unconformity to homoclinal ramp to foreland-basin deposition associated wi.th a convergent margin (Mussman and Read. 1986). The unconformity probably is related to island arc-continent or microplate continent collision and uplift during the Early Middle Ordovician (Whitrockian 7) (Shanmugam and Lash. 1982) coupled with eustatic sea level lowering. This collision can be considered an early phase of the Taconic Orogeny of Rodgers (1971). Preunconformity depocenters. one to the north of the field trip area in Maryland and Pennsylvania and one to the south in southwestern Virginia and Tennessee, may have influenced the development of the unconformity and the depositional fabric and thickness of Middle Ordovician deposits (Colton. 1970; Read. 1980; Mussman and Read. 1986).
Petroleum Abstracts
Author: Late Cenozoic Structure and Evolution of the Great Basin-Sierra Nevada Transition
Author: John S. OldowPublisher: Geological Society of America
ISBN: 0813724473
Category : Science
Languages : en
Pages : 384
Book Description
Stratigraphy of the Owens Valley Group (Permian), Southern Inyo Mountains, California
Author: Paul StoneActa Universitatis Carolinae
Author: Stratigraphy and Depositional History of the Owens Valley Formation at the Type Locality Inyo County, California
Author: David E. ConleyPublisher:
ISBN:
Category : Geology
Languages : en
Pages : 126
Book Description
Paleoclimatic Reconstructions from Owens Lake Core OL-92, Southeastern California
Author: Kirsten Margaret MenkingPublisher:
ISBN:
Category : Paleoclimatology
Languages : en
Pages : 420
Book Description
In 1992, the U.S. Geological Survey cored Owens Lake to obtain a continuous paleoclimate record for the Sierra Nevada region. Owens Lake heads a chain of closed-basin lakes which are separated by a series of bedrock sills, received their water primarily from Sierra Nevadan precipitation, and overflowed during wet periods. The core records the histories of cyclic glaciation of the Sierra Nevada and water-balance of Owens Lake over the past 800 kyrs. A variety of paleoclimatic proxies have been studied, details of which may be found in Smith and Bischoff (1993). In this thesis, I report the results and interpretations of 1) grain-size and clay-mineralogical analyses performed on 3.5-m-long channel samples (%7500 years of sedimentation per sample) and point samples, 2) grain size, carbonate content, and oxygen isotopic measurements on 70-cm-long channel samples (%1500 years), and 3) a water-balance model used to infer the magnitude of runoff and evaporation changes necessary to fill the lakes in the Owens Lake system, and to determine the response time of the lake chain to climatic perturbations.