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North Chickamauga Creek basin
Stratigraphy and Environmental Sedimentology of Chickamauga Group, Middle Ordovician of Eastern Tennessee: GEOLOGIC NOTES
Regional Paleozoic Stratigraphy in Mississippi Between Ouachita and Appalachian Mountains: DISCUSSION
Regional Paleozoic Stratigraphy in Mississippi Between Ouachita and Appalachian Mountains: REPLY TO F. F. MELLEN
Regional Paleozoic Stratigraphy in Mississippi Between Ouachita and Appalachian Mountains
Mechanics of Appalachian Folding as Illustrated by Sequatchie Anticline, Tennessee and Alabama
A NEW CAMBRIAN ACRITARCH FROM THE NOLICHUCKY SHALE, EASTERN TENNESSEE, U.S.A.
History of Development and Geologic Relationships of Appalachian Fields
Lower Middle Ordovician of Southwest Virginia and Northeast Tennessee
Stratigraphic Significance of Graptolites of Athens Shale: PART 1
Exceptionally preserved conodont apparatuses with giant elements from the Middle Ordovician Winneshiek Konservat-Lagerstätte, Iowa, USA
Fault gouge dating in the Southern Appalachians, USA
Coal mining impacts and remediation in the Chattanooga region: Field trip to North Chickamauga Creek upper watershed
Abstract Upper North Chickamauga Creek in Hamilton and Sequatchie Counties, Tennessee, is severely impacted by acid mine drainage (AMD) emanating from more than 15 abandoned coal mines in headwater tributaries. AMD is formed when pyrite and other sulfide minerals are exposed to air and water during coal mining. It is characterized by low pH (<2.8) and elevated concentrations of acidity, iron, aluminum, sulfate, and other pollutants. These attributes tend to be toxic to most aquatic life and result in reduced aesthetics and potential uses of the water. The North Chickamauga Creek Watershed Restoration Project is a multi-organizational effort to restore the upper 18 miles of the North Chickamauga Creek watershed to a level that will support a warm-water fishery. Several passive treatment systems (PTS) have been installed at abandoned mining sites in the North Chickamauga Creek watershed where AMD is generated and is flowing into surface waters. PTS is the engineered use of natural and enhanced geological, biological, chemical, and physical processes to prevent pollutant generation or to remove pollutants from aqueous discharges. PTS include technologies such as constructed wetlands, anoxic limestone drains, mine seals and flooding, successive alkalinity-producing systems, limestone trenches, and other components. During this field trip to the upper reaches of the North Chickamauga Creek watershed, we will visit several of the operational systems and observe untreated AMD. Participants will gain an understanding of how AMD is generated, its impacts and characteristics, and how it can be prevented or treated. This field trip requires extensive hiking over moderate slopes and sometimes vegetated terrain.
Dianulites (Trepostomata, Bryozoa) from the Early Ordovician of Severnaya Zemlya, Arctic Russia
UNDERSTANDING AND PRESERVING CAVES AND KARST LANDSCAPES
MIDDLE ORDOVICIAN (CHAZYAN) SEA-LEVEL CHANGES AND THE EVOLUTION OF THE ORDOVICIAN CONODONT GENUS CAHABAGNATHUS BERGSTRÖM, 1983
The Ordovician Sebree Trough: An oceanic passage to the Midcontinent United States
Micromorphology and Stable-Isotope Geochemistry of Historical Pedogenic Siderite Formed in PAH-Contaminated Alluvial Clay Soils, Tennessee, U.S.A.
ABSTRACT This field guide highlights the Paleozoic geology of the Knoxville, Tennessee, area, framed in the context of the historic, halcyon days of Knox County’s marble industry and the railroads built to serve the area’s many limestone quarries and mills. The Three Rivers Rambler excursion train (the “Rambler”) is pulled by an 1890 “Consolidation” steam locomotive, which has been restored and is now operated by the Knoxville & Holston River Railroad Co., Inc. The Rambler route follows the north bank of the Tennessee River; passes through a sequence of Lower and Middle Ordovician carbonates, shales, and sandstones of the Knox and Chickamauga Groups; crosses the High Bridge at the confluence of the Holston and French Broad Rivers; and ends near Marbledale Quarry before returning to Knoxville. The two geologic groups are dominated by carbonates and lie in the syncline that contained most of the commercial marble that was quarried in the Knoxville area for the past 150 years. Exposures of the Holston Formation, a limestone commercially referred to as Holston [M]arble, were excavated to build the railroad ~125 years ago. It is possible to observe four of the seven formations making up the Knox and Chickamauga Groups along the route, but the outcrops are not accessible during typical railroad operations or by automobile. Arrangements were made for a field trip during the 2018 Geological Society of America Southeastern Section meeting, and this guide provides details for four selected exposures between Knoxville and the Forks of the River Marble District, with three optional stops. Only during the field trip, passengers will be able to disembark the train to examine carbonate and shale outcrops, structures, and discuss facies relationships of the foreland basin bryozoan reef deposits along the western flank of the Taconic (Sevier) foredeep. In addition to the local geology, this field guide describes the key role of railroads in the development of the Knox County marble industry, the history of what is today the Knoxville & Holston River Railroad, a corporate descendent of the 1887 Knoxville Belt Railroad Company, and the Tennessee Marble industry.