Douglas Lake Member
Geologic formation in Tennessee, United States / From Wikipedia, the free encyclopedia
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The Douglas Lake Member is a geologic unit of member rank[2] of the Lenoir Limestone that overlies the Mascot Dolomite and underlies typical nodular member of the Lenoir Limestone in Douglas Lake, Tennessee, region. It fills depressions that are part of a regional unconformity at the base of Middle Ordovician strata, locally the Lenoir Limestone, that separates them from the underlying Lower Ordovician strata, locally the Knox Group.[1][2][4]
Quick Facts Type, Unit of ...
Douglas Lake Member[1][2] | |
---|---|
Stratigraphic range: Darriwilian [3] | |
Type | Member[2] |
Unit of | Lenoir Limestone |
Underlies | nodular member of Lenoir Limestone |
Overlies | Mascot Dolomite (Knox Group) |
Thickness | up to 37 meters (121 ft) |
Lithology | |
Primary | rubble conglomerate, chert conglomerate, and black dolomite[1] |
Other | Shale (shaly dolomite), volcanic ash[4] |
Location | |
Region | eastern Tennessee |
Country | USA |
Extent | discontinuous, paleokarst fills in top of Mascot Dolomite |
Type section | |
Named for | Douglas Lake (Douglas Reservoir) |
Named by | J. Bridge[1] |
Location | north shore of Douglas Lake, 2.4 kilometers (1.5 mi) northeast of the Douglas Dam |
Year defined | 1995 |
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