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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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United States
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Illinois
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Hardin County Illinois (1)
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Jackson County Illinois (1)
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Saline County Illinois (1)
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Illinois Basin (1)
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Missouri (1)
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commodities
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fluorspar deposits (1)
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mineral deposits, genesis (1)
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elements, isotopes
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carbon
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C-13/C-12 (1)
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isotope ratios (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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fossils
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Chordata
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Vertebrata (1)
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Graptolithina (1)
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Hemichordata (1)
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microfossils
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Conodonta (1)
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problematic microfossils (1)
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problematic fossils
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problematic microfossils (1)
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Pterobranchia (1)
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geologic age
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Paleozoic
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Carboniferous
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Pennsylvanian
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Lower Pennsylvanian (1)
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Devonian (1)
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Silurian
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Bainbridge Formation (1)
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Primary terms
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carbon
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C-13/C-12 (1)
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Chordata
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Vertebrata (1)
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fluorspar deposits (1)
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Graptolithina (1)
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Hemichordata (1)
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intrusions (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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mineral deposits, genesis (1)
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paleogeography (1)
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paleontology (1)
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Paleozoic
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Carboniferous
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Pennsylvanian
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Lower Pennsylvanian (1)
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Devonian (1)
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Silurian
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Bainbridge Formation (1)
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problematic fossils
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problematic microfossils (1)
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Pterobranchia (1)
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sedimentary rocks
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carbonate rocks
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limestone
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biomicrite (1)
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tectonics (1)
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United States
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Illinois
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Hardin County Illinois (1)
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Jackson County Illinois (1)
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Saline County Illinois (1)
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Illinois Basin (1)
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Missouri (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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limestone
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biomicrite (1)
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Integrated δ 13 C carb , conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group
Abstract Minerals have been extracted from the Illinois-Kentucky Fluorite District for over 170 years. Theories concerning the inter-relationship between the fluorite mineralization, tectonism, and igneous activity will be discussed by several geologists during this field trip. The Columbia mine (vein deposit) will be visited in Kentucky, and the only mine currently producing fluorite in this district, the Hastie Limestone Quarry (strata-bound deposit), will be visited in Illinois. The mining history of this region will be explained at the American Fluorite Museum, where numerous mineral specimens can be examined. The Hicks Dome, a Permian crypto-volcanic feature (?) in Illinois, will also be discussed. The trip will conclude with a walking tour at the Garden of the Gods Recreational Area to view the Eagle Valley Syncline and Lower Pennsylvanian units.
Abstract A major unconformity at the base of the Middle Devonian defines the lower limit of the Kaskaskia sequence throughout most of the Illinois basin (Figure 7-1). Locally the unconformity occurs below Upper Devonian shale; elsewhere it occurs below uppermost Lower Devonian limestone. The Tippecanoe-Kaskaskia unconformity does not exist in the deeper part of the Illinois basin area in southeastern Illinois, southwestern Indiana, and western Kentucky (Collinson et al., 1967). The upper boundary of the Kaskaskia sequence is marked by the major sub-Absaroka (sub-Pennsylvanian) unconformity, which resulted from a synchronous worldwide lowering of sea level (Saunders and Ramsbottom, 1986). This surface also marks the contact between the Lower and Middle Carboniferous rocks within the Illinois basin. The Kaskaskia sequence includes siliciclastics and carbonates (Figure 2-12) that were deposited over an interval of approximately 60 m.y. In the basin area, these rocks overlie Ordovician through Lower Devonian rocks (Figure 2-11) and range in thickness from 1200 ft (370 m) in the north to about 3600 ft (1000 m) in the south (Figures 2-13 and 7-2). The Kaskaskia is by far the greatest hydrocarbon-producing sequence in the Illinois basin and includes the major source beds (the New Albany Group Shale). Most of the production has been and continues to be from Upper Mississippian sandstones in the Chesterian Series at the top of the sequence. Other significant Kaskaskia production includes the Middle Mississippian (Valmeyeran) Aux Vases Sandstone (Aux Vases Formation in Indiana), the Ste. Genevieve Limestone, the Salem Limestone, the Middle Devonian Grand Tower
Kaskaskia Sequence: Middle and Upper Devonian Series through Mississippian Kinderhookian Series
Abstract In Illinois, the lower part of the Kaskaskia sequence is represented by time-transgressive carbonate rocks of the Muscatatuck Group (Shaver, 1974) that are primarily Middle Devonian (Erian) in age (Figure 7-1). In Kentucky and in adjacent parts of Indiana, strata in the lowermost part of the Kaskaskia sequence have been reported as being Early Devonian (Ulsterian) in age (Oliver, 1967). Middle Devonian rocks were deposited during a 5 m.y. period. These carbonate rocks reach a maximum thickness of about 400 ft (122 m) in western Kentucky, southeastern Illinois, and the southwestern tip of Indiana (Figure 8-1). Muscatatuck rocks were probably thicker to the south in and adjacent to the New Madrid rift complex, but they were truncated by the subsequent uplift and erosion of the Pascola arch. A major regression during late Early Devonian time resulted in the sub-Kaskaskia unconformity (Figure 2-11). Early Middle Devonian sedimentation was greatly affected by the highly dissected sub-Kaskaskia surface (Droste and Shaver, 1975). Many Silurian reefs were exhumed and subjected to erosion at this time. In western Illinois, drill holes that were cut into both Silurian and Lower Devonian rocks have penetrated channels as much as 50 ft (16 m) deep. In the northern part of the basin, in Indiana and Illinois, solution fissures filled with Middle Devonian rocks penetrate 70 ft (22 m) into Silurian rocks (Meents and Swann, 1965). The Tippecanoe-Kaskaskia unconformity does not exist in parts of southeastern Illinois, southwestern Indiana, and western Kentucky, where areas of the Illinois basin are