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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China
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Meishan China (1)
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Vietnam (1)
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Blue Mountains (1)
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Commonwealth of Independent States
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Caucasus
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Russian Federation
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Europe
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Caucasus
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Southern Europe
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Mexico
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United States
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Alabama
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elements, isotopes
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (1)
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oxygen
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O-18/O-16 (1)
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fossils
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Invertebrata
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Brachiopoda (3)
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Cnidaria
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Anthozoa
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Zoantharia
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Rugosa (2)
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Echinodermata
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Protista
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microfossils
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Yates Formation (1)
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Primary terms
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Asia
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Far East
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China
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Meishan China (1)
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Vietnam (1)
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biogeography (2)
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carbon
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C-13/C-12 (1)
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Europe
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Caucasus
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Northern Caucasus
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Peredovoy Range (1)
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Southern Europe
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Greece (2)
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faults (1)
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Invertebrata
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Brachiopoda (3)
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Cnidaria
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Anthozoa
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Zoantharia
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Rugosa (2)
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Echinodermata
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Asterozoa
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Stelleroidea
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Ophiuroidea (1)
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Mollusca
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Cephalopoda
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Ammonoidea (1)
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Protista
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Foraminifera
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Fusulinina
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Fusulinidae (6)
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Rotaliina
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Nodosariacea
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Nodosariidae
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Nodosaria (1)
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-
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Radiolaria (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (1)
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Mediterranean region (1)
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Mesozoic
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Triassic
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Lower Triassic
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Permian-Triassic boundary (1)
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Upper Triassic (1)
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Mexico
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Coahuila Mexico (1)
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oxygen
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O-18/O-16 (1)
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paleoclimatology (1)
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paleogeography (3)
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paleomagnetism (1)
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paleontology (5)
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Paleozoic
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Carboniferous
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Mississippian
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Upper Mississippian
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Bangor Limestone (1)
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Chesterian (1)
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Devonian (1)
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Permian
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Guadalupian
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Capitanian (1)
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Grayburg Formation (1)
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Tansill Formation (1)
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Lower Permian
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Cisuralian
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Artinskian (1)
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-
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Middle Permian (3)
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Upper Permian
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Lopingian
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Changhsingian (1)
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Permian-Triassic boundary (1)
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Zechstein (1)
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Yates Formation (1)
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Plantae
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algae (1)
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sedimentary rocks
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carbonate rocks
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limestone (3)
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chemically precipitated rocks
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chert (1)
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clastic rocks
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diamictite (1)
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sedimentation (1)
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stratigraphy (6)
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structural analysis (1)
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United States
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Alabama
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Franklin County Alabama (1)
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California
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Butte County California (1)
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Northern California (2)
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Shasta County California (1)
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Trinity County California (1)
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Delaware Basin (1)
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Hayfork Terrane (1)
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Klamath Mountains (1)
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Nevada
-
Elko County Nevada (1)
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New Mexico
-
Eddy County New Mexico (1)
-
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Oregon
-
Crook County Oregon (2)
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Grant County Oregon (2)
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Harney County Oregon (1)
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Texas
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Midland Basin (1)
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Midland County Texas (1)
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West Texas (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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limestone (3)
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chemically precipitated rocks
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chert (1)
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clastic rocks
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diamictite (1)
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volcaniclastics (1)
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sediments
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volcaniclastics (1)
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Middle Permian (Guadalupian) Fusulinids from Subsurface Midland Basin, West Texas, USA, Including Paleoenvironmental Microspheric Parafusulina
Revision of the unusual Carboniferous ophiuroid Cholaster (Echinodermata) and remarks on skeletal differentiation within the Asterozoa
The Permian–Triassic boundary Lung Cam expanded section, Vietnam, as a high-resolution proxy for the GSSP at Meishan, China
Mixed Tethyan and McCloud Belt Rugose Corals and Fusulinids in an Upper Triassic Conglomerate, Central Oregon
Abstract Here we establish a magnetostratigraphy susceptibility zonation for the three Middle Permian Global boundary Stratotype Sections and Points (GSSPs) that have recently been defined, located in Guadalupe Mountains National Park, West Texas, USA. These GSSPs, all within the Middle Permian Guadalupian Series, define (1) the base of the Roadian Stage (base of the Guadalupian Series), (2) the base of the Wordian Stage and (3) the base of the Capitanian Stage. Data from two additional stratigraphic successions in the region, equivalent in age to the Kungurian–Roadian and Wordian–Capitanian boundary intervals, are also reported. Based on low-field, mass specific magnetic susceptibility (χ) measurements of 706 closely spaced samples from these stratigraphic sections and time-series analysis of one of these sections, we (1) define the magnetostratigraphy susceptibility zonation for the three Guadalupian Series Global boundary Stratotype Sections and Points; (2) demonstrate that χ datasets provide a proxy for climate cyclicity; (3) give quantitative estimates of the time it took for some of these sediments to accumulate; (4) give the rates at which sediments were accumulated; (5) allow more precise correlation to equivalent sections in the region; (6) identify anomalous stratigraphic horizons; and (7) give estimates for timing and duration of geological events within sections.
Abstract Sequence stratigraphic models were developed in the 1980s to predict lateral and vertical relationships among rocks derived from siliciclastic depositional paleoenvironments. The basic underlying assumption for sequence stratigraphy is that sea level fluctuates on a periodic basis as a result of a few overarching processes (tectonics, sediment supply, eustasy) and that changes in the lateral positions of the depositional paleoenvironments are expressed in the preserved stratal sequences. The original model was based upon a juxtaposed onshore terrestrial coastal plain, beach, and offshore passive margin siliciclastic basin. Subsequent studies have examined other types of coastlines, ones that differed from the initial model. The Pennsylvanian–Permian Casper Formation in southeastern Wyoming contains strata developed from an onshore dune field adjacent to an offshore carbonate ramp, a combination of paleoenvironments not previously examined in sequence stratigraphy. As with any research that is based on periodicity, an age constraint needs to be applied to the observed cycles. In the Casper Formation, there are no interspersed ash layers or many fossils in the section studied to provide these data. There are, however, a few limestone units that contain fusulinids. Given the recent developments in fusuline research, ages of rock layers which hold fusulinids are now datable to a very fine scale. Using the fusulinids that are contained in a few of the Casper Formation sequences, a timing of the periodicity of the cycles is preliminarily established. Additional investigation is needed to provide a more robust database. Interestingly enough, the periodicity that has been found is a longer frequency than the more commonly accepted Milankovitch cycles and provides some support for more recent studies that have proffered evidence for these lower-frequency Milankovitch perturbations. Geologic Problem Solving with Microfossils: A Volume in Honor of Garry D. Jones SEPM Special Publication No. 93, Copyright © 2009 SEPM (Society for Sedimentary Geology), ISBN 978-1-56576-137-7, p. 253–267.