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However, the Kentucky Geological Survey estimated a cumulative total of 200,000 wells in 1992, with 23,000 oil wells and 11,000 gas wells producing in 1989. The Eastern Coal Field and Western Coal Field have been the mine sites of production, with little exploration in the Jackson Purchase and Bluegrass regions.
The 12-mile (19 km) long Cumberland Gap consists of four geologic features: the Yellow Creek valley, the natural gap in the Cumberland Mountain ridge, the eroded gap in Pine Mountain, and Middlesboro crater. Middlesboro crater is a 3-mile (4.8 km) diameter meteorite impact crater in which Middlesboro, Kentucky, is located.
USGS physiographic map of Kentucky showing the location of the Knobs. The Knobs Region or The Knobs is located in the US state of Kentucky. It is a narrow, arc-shaped region consisting of hundreds of isolated hills. The region wraps around the southern and eastern parts of the Bluegrass region in the north central to northeastern part of the state.
The Red River is a 97.2-mile-long (156.4 km) [2] tributary of the Kentucky River in east-central Kentucky in the United States. Via the Kentucky and Ohio rivers, it is part of the Mississippi River watershed. It rises in the mountainous region of the Cumberland Plateau, in eastern Wolfe County, approximately 15 miles (24 km) east of Campton.
The Mississippian Borden Formation is a mapped bedrock unit in Kentucky, Indiana, Illinois, Ohio, West Virginia, [7] and Tennessee. It has many members, which has led some geologists to consider it a group (for example in Indiana [8]) rather than a formation (for example in Kentucky [1] [4]).
Fossils from the Ordovician are commonplace in the geologic formations which make up the Cincinnati Arch and are commonly studied along man made roadcuts. The Nashville Dome of Tennessee and the Jessamine Dome or Lexington Dome [ 1 ] of central Kentucky make up the central portion of the arch.
Geological map of Mammoth Cave National Park, incl. St. Louis Limestone Outcrops of the St. Louis Limestone near Frenchburg, Kentucky. The St. Louis Limestone is a large geologic formation covering a wide area of the midwest of the United States. It is named after an exposure at St. Louis, Missouri.
Like the Cretaceous, the geologic record of Kentucky contains deposits left on both land and sea during the Tertiary. [4] Also like the Cretaceous, Kentucky preserves plant fossils from this age. [4] Kentucky's Tertiary flora left behind fossil fruits, cones, flower petals and stems in places like Ballard, Graves, and Fulton Counties.