The alluvium forms floodplains and terraces of the Licking River Valley.
It is too thin in tributary valleys to have distinctive topography.
The alluvium yields little water from fine-grained material. It yields
small to moderate amounts of water to drilled wells in the Licking River
Valley, most wells yielding more than 500 gallons per day. Water is
hard, and near the valley walls of the Licking it may have a high iron
content. Wells that penetrate the alluvium and enter bedrock obtain
little additional water, and this water may contain objectionable amounts
of salt or hydrogen sulfide.
Clays Ferry Formation and its Point Pleasant Tongue (Okc)
The Clays Ferry forms broad, flat valley bottoms along large streams
between steep, narrow ridges. Limestone has undergone solution and in
some areas is characterized by small sinkholes and subsurface drainage.
Smaller streams develop long, narrow, winding, V-shaped valleys similar
to those of the Kope Formation.
The Clays Ferry yields more than 500 gallons per day to wells drilled
in the valley bottom and small amounts of water to wells on hillsides
and hilltops. It also yields water to small springs. Water is hard or
very hard and may contain salt or hydrogen sulfide, particularly in
wells in valley bottoms; hydrogen sulfide especially, but also salt,
may be found in wells on hillsides. Beneath broad interstream areas,
much solutional enlargement of fractures and bedding-plane openings
has taken place in the soluble zones beneath tributary streams, and
many drilled wells produce 100 to 500 gallons per day. Some wide, flat
areas have small sinkholes and some underground drainage.
Lexington Limestone (Tanglewood Limestone, Grier, Logana Members)
The Lexington forms flat valley bottoms along the Licking River.
The limestone yields more than 500 gallons per day to wells in valley bottoms
and as much as 150 gallons per minute in places. Water is hard and may contain
salt or hydrogen sulfide in some places.
The U.S. Geological Survey's Hydrologic
Atlas Series, published cooperatively with the Kentucky Geological
Survey, provides hydrologic information for the entire state.
to "Groundwater Resources in Kentucky"