Stratigraphy of the Mascot-Jefferson City zinc district, Tennessee

Abstract

Introduction, by John Rodgers-________-___________ Scope and purpose of the present report_________ Work before 1929_____________________ Recent work in the Knox group of East Tennessee __ The geologic map and mapping procedures._______ Acknowledgments___ _________________________ Geography_______________________________________ Stratigraphy ____-_____-_______________________ Pre-Knox formations__________________________ Summary description______________________ Names and distribution________________ Rome formation____________________ Rutledge limestone____________________ Rogersville shale______________________ Maryville limestone_____________________ Nolichucky shale_________________ Maynardville limestone member of Nolichucky shale_______ _____________________________ General features. ___________ ________________ Facies relationships.________________ Topographic expression_______________ Paleontology and correlation _____________ Knox group______________________________ General remarks____________________________ Definition____________________________ History____________________________ Present usage._________________________ Ozarkian and Canadian systems of Ulrich__ Copper Ridge dolomite.___________________ Name.______________________________ Distribution ___________________________ Limits and thickness____________________ Bedrock lithology_____________________ Residual products_____________________ Subdivisions. _____'_____________________ Facies relationships__________________ Paleontology and correlation.____________ Chepultepec dolomite.______________________ Name.

Ground-water availability in carbonate rocks of the Dandridge area, Jefferson County, Tennessee

“…The geology of the Dandridge area has been reported in the 1:24,000scale geologic map of the Jefferson City quadrangle by Hatcher and Bridge (1973) and in an unpublished thesis (Feder, 1963) on the geology of Oak Grove. Bridge (1956) presents a detailed discussion of the stratigraphy and the lithologic criteria used in subdividing the Knox Group into five formations in the adjacent Jefferson City zinc mining district. DeBuchananne and Richardson (1956) Figure 1.…”

“…Outcrops of hard rock of the Knox Group are very scarce, requiring that previous geologic mapping of this unit be done largely on the basis of the occurrence of various types of chert and sandstone fragments in the overlying residual soil. The Chepultepec Dolomite is one of the most soluble formations in the Knox Group (Bridge, 1956). It also has the greatest variety of rock types in its bedding sequence (table 2), and its outcrop area has the second most abundant occurrence of sinkholes.…”

“…These grooves give the weathered surface of the rock a gashed or slashed appearance. They are always associated with dolomite (Bridge, 1956). Microscopic examination reveals these gashes to be microfractures in the dolomite from which the calcite filling has been dissolved (Feder, 1963).…”

“…The 300 ft of section immediately beneath the contact between the Copper Ridge Dolomite and the Chepultepec Dolomite is characterized by the occurrence in the section of thin beds of dolomite-cemented quartz sandstones and siltstones. It is the only part of the 3,000 ft of section in the Knox Group that is so characterized (Bridge, 1956;Hatcher and Bridge, 1973). Therefore, siltstone may be an indicator of greater solution development potential than other lithologies in the Knox Group.…”

“…The site is underlain by the Kingsport Formation of Bridge (1956) and Mascot Dolomite of Bridge (1956) at the top of the Knox Group and by a part of the overlying Lenoir Limestone (table 1). Based upon previous geologic mapping (Hatcher and Bridge, 1973), the rocks at the site lie within the northwest or downthrown block of a steep reverse fault (figs.…”