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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Asia
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Mesozoic
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Paleozoic
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Bonneterre Formation (1)
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Mount Simon Sandstone (2)
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Carboniferous
-
Jackfork Group (1)
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-
Barnett Shale (1)
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-
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-
Fort Payne Formation (8)
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Pocono Formation (1)
-
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Sunbury Shale (1)
-
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-
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Fayetteville Formation (3)
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-
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-
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-
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-
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-
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-
Upper Pennsylvanian
-
Missourian (1)
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-
-
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Catskill Formation (1)
-
Chattanooga Shale (19)
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-
-
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-
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-
Marcellus Shale (6)
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-
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Millboro Shale (2)
-
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-
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Ohio Shale (5)
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-
-
-
Hunton Group (1)
-
Knox Group (7)
-
lower Paleozoic
-
Ashe Formation (1)
-
-
New Albany Shale (8)
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-
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-
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-
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-
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Trenton Group (2)
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-
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Road River Formation (1)
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-
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Wenlock (1)
-
-
-
upper Paleozoic
-
Arkansas Novaculite (2)
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-
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Woodford Shale (4)
-
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-
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upper Precambrian
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pyroclastics (4)
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amber (1)
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-
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orthosilicates
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-
sheet silicates
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clay minerals
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smectite (2)
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New Albany Shale (8)
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Woodford Shale (4)
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Chattanooga Tennessee
Biomarker evidence of algal-microbial community changes linked to redox and salinity variation, Upper Devonian Chattanooga Shale (Tennessee, USA)
Chattanooga Shale in Tennessee—Resource Evaluation
Cranmore Cove–Chattanooga fault system: A model for the structure along the Allegheny front in southern Tennessee
Sandy zones in the Chattanooga of the Eastern Highland Rim, Tennessee
SUB-CHATTANOOGA RESIDUUM IN TENNESSEE AND KENTUCKY
Speleothems are valuable archives of climate change because of their extraordinary time resolution, which is unattainable in other terrestrial climate proxies. Analyses of 4796 ultraviolet fluorescent (UVf) layers observed in polished thin sections of a 15-cm-long speleothem collected from Raccoon Mountain Cave near Chattanooga, Tennessee, USA, as well as 200 δ 13 C and δ 18 O measurements and 11 high-precision U/Th dates permit refined interpretations of middle and late Holocene paleoclimate records in the southeastern United States. Speleothem UVf layers average 0.015 mm, identical to the average growth rate determined for the middle and late Holocene portions of the speleothem (ca. 7600–400 yr B.P.) based on the U/Th ages and interval thicknesses. UVf layer counts between paired U/Th ages are also consistent with determined ages and further support their interpretation as annual layers. The middle Holocene is typified by 100–400 yr intervals of higher rainfall characterized by thin UVf layers (0.003–0.010 mm) and more-negative δ 13 C values (−3‰ to −6‰ Peedee belemnite [PDB]), punctuated by shorter periods (5–20 yr, rarely 50–100 yr) of lower rainfall with thicker UVf layers (0.030–0.080 mm) and less-negative δ 13 C values (−1‰ to −3‰ PDB); “extreme drought” events are characterized by both the thickest UVf layers (0.150–0.170 mm) and the least-negative δ 13 C values (+0.05‰ to −1‰ PDB). The late Holocene, in comparison, is characterized by overall wetter conditions and more regular (sinusoidal curve) behavior, suggesting 50–100 yr cycles of higher and lower rainfall, with UVf layers ranging from 0.005 to 0.030 mm/yr. Statistical analyses of UVf layer thicknesses using order-two momentum threshold vector autoregressive models (MTVAR2) quantify the relationship between δ 13 C and δ 18 O, dependent upon the momentum in the climate. This study demonstrates that thickness of annual layers in speleothems can be used to resolve detailed paleorainfall records, provided there is preservation of organic matter sufficient to excite UVf response; however, relationships among changes in rainfall amounts, stable isotope values of speleothem calcite, and thicknesses of UVf annual layers (≈growth rates) are not straightforward.
Ringgold Gap: Progradational sequences in the Ordovician and Silurian of northwest Georgia
Abstract North end of Taylor Ridge, on south side of I-75, southeast of Chattanooga, Tennessee, 10 mi (16 km) southeast from junction of I-24 and I-75. Catoosa County, Georgia, Ringgold 7½-minute quadrangle. Accessible from I-75 or via frontage road eastward from the western of two Ringgold exits (Georgia 151, Fig. 1). The cut may be conveniently examined away from traffic on the first or second terrace.