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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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North America
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Appalachian Basin (2)
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Appalachians
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Valley and Ridge Province (1)
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United States
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Maryland
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Allegany County Maryland
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Cumberland Maryland (1)
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Pennsylvania
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Bedford County Pennsylvania (1)
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Blair County Pennsylvania (1)
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Fayette County Pennsylvania (2)
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Indiana County Pennsylvania (1)
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Virginia (1)
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West Virginia
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Barbour County West Virginia (2)
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Doddridge County West Virginia (1)
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Harrison County West Virginia (1)
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Lewis County West Virginia (1)
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Marion County West Virginia (1)
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Monongalia County West Virginia (3)
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Preston County West Virginia (7)
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Randolph County West Virginia (1)
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Taylor County West Virginia (1)
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Tucker County West Virginia (1)
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Tyler County West Virginia (1)
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Upshur County West Virginia (1)
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Wetzel County West Virginia (1)
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fossils
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ichnofossils (2)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea (1)
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Mollusca
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Bivalvia (1)
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geologic age
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Paleozoic
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Carboniferous
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Mississippian
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Lower Mississippian (2)
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Price Formation (1)
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Sunbury Shale (1)
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Upper Mississippian
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Chesterian (1)
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Mauch Chunk Formation (1)
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Devonian
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Middle Devonian
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Hamilton Group (1)
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Mahantango Formation (1)
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Marcellus Shale (1)
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Onondaga Limestone (1)
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Tully Limestone (1)
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Upper Devonian
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Hampshire Formation (1)
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Ordovician
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Upper Ordovician
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Juniata Formation (1)
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Katian (1)
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Primary terms
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deformation (1)
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glacial geology (1)
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ichnofossils (2)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea (1)
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Mollusca
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Bivalvia (1)
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North America
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Appalachian Basin (2)
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Appalachians
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Valley and Ridge Province (1)
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paleoecology (1)
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paleogeography (2)
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paleontology (3)
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Paleozoic
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Carboniferous
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Mississippian
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Lower Mississippian (2)
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Price Formation (1)
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Sunbury Shale (1)
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Upper Mississippian
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Chesterian (1)
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Mauch Chunk Formation (1)
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Devonian
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Middle Devonian
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Hamilton Group (1)
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Mahantango Formation (1)
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Marcellus Shale (1)
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Onondaga Limestone (1)
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Tully Limestone (1)
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Upper Devonian
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Hampshire Formation (1)
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Ordovician
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Upper Ordovician
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Juniata Formation (1)
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Katian (1)
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sea-level changes (2)
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sedimentary petrology (1)
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sedimentary rocks
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carbonate rocks (1)
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clastic rocks
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red beds (1)
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sandstone (2)
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sedimentation (3)
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sediments (1)
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stratigraphy (1)
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United States
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Maryland
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Allegany County Maryland
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Cumberland Maryland (1)
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Pennsylvania
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Bedford County Pennsylvania (1)
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Blair County Pennsylvania (1)
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Fayette County Pennsylvania (2)
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Indiana County Pennsylvania (1)
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Virginia (1)
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West Virginia
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Barbour County West Virginia (2)
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Doddridge County West Virginia (1)
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Harrison County West Virginia (1)
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Lewis County West Virginia (1)
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Marion County West Virginia (1)
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Monongalia County West Virginia (3)
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Preston County West Virginia (7)
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Randolph County West Virginia (1)
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Taylor County West Virginia (1)
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Tucker County West Virginia (1)
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Tyler County West Virginia (1)
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Upshur County West Virginia (1)
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Wetzel County West Virginia (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks (1)
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clastic rocks
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red beds (1)
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sandstone (2)
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siliciclastics (1)
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sediments
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sediments (1)
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siliciclastics (1)
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ABSTRACT The Upper Ordovician Juniata Formation, Central Appalachian Basin, USA, is a thick succession of cyclically bedded arenites, wackes, and mudrocks. Sedimentary facies of the formation in West Virginia, Virginia, and Maryland indicate cyclic peritidal deposition along the northern shoreline of the basin. The subsurface Juniata Formation has been drilled throughout the basin, and long, continuous well logs are available for analysis of the cyclic deposition. A 2400-ft-long (731.52-m-long) gamma-ray (GR) log from the Preston 119 well, northern West Virginia, provides a proxy of terrigenous siliciclastic fluxes originating from the Taconic highlands, from the early Ashgillian to the Ordovician–Silurian transition. Strong cycling in the GR log shows evidence for Milankovitch-forced sea-level oscillations, hypothesized to have been produced by dynamic Late Ordovician glaciation in polar (southern) Gondwana. Juniata cycle frequencies are different from those of Quaternary Milankovitch cycles, with significantly higher obliquity and precession index frequencies, consistent with a 21.5 h Ordovician day and an Earth-Moon distance that was 95% of present day. These results support John Dennison’s long-held view that Milankovitch forcing of sedimentation took place in the early Paleozoic Appalachian Basin by action of remotely generated glacio-eustatic oscillations powered by glaciation on southern Gondwana, and that this sedimentary record has tracked “Earth’s movement through space.”
ABSTRACT This study examines the usefulness of accommodation plots (Fischer plots) as a means of correlating mixed carbonate-siliciclastic strata in the subsurface. Fischer plots have been widely used to extract accommodation changes from carbonate platforms, but there are few published studies of siliciclastic or mixed carbonate-siliciclastic environments. The Middle Devonian of the Appalachian Basin is penetrated by thousands of wells, is exposed in numerous exceptional outcrops, and is an excellent place to test the usefulness of accommodation history plots as correlation tools. In the past, researchers have used cores, well cuttings, well logs, and outcrop gamma-ray profiles to correlate between outcrop and subsurface data, but all these methods have their limitations. Gamma-ray logs for wells penetrating the Middle Devonian from eight locations, from Preston County in the east to Wetzel County, West Virginia, in the west, were used in this study. Accommodation cycle thicknesses were measured from gamma-ray logs, printed at a vertical scale of one inch per ten feet (2.5 cm/3 m). The accommodation cycle thickness data were entered into Antun Husinec’s FISCHERPLOTS program to produce accommodation plots. Next, well-documented, outcrop-based sequence stratigraphy was used to help interpret the results of the accommodation plots. This study demonstrates that using accommodation plots is a novel way of overcoming the uncertainties and biases of other methods. The use of this approach in other mixed carbonate-siliciclastic successions with abundant subsurface data would help to demonstrate that Fischer plots are a novel and useful approach that can help remove many of the uncertainties and biases encountered in stratigraphic correlation.