Table 3. Geologic and hydrologic units at the study site
|
Stratigraphic unit |
Lithology1 |
Thickness at study site2 (meters) |
Hydrogeologic characteristics at study site2 |
|
Regolith |
Low permeability clay |
1 to 6 |
Shallow water-bearing zone near top of bedrock. |
|
Lebanon Limestone |
Relatively pure limestone with beds averaging 5.1 to 7.6 cm in thickness. Limestone beds are separated by partings of calcareous shale ranging from 0 to 1.3 cm in thickness. |
6 to 24 |
Leaky confining unit |
|
Upper Ridley Limestone |
Relatively pure, massively bedded limestone with little insoluble material. Beds ranging from 10 to 120 cm in thickness. |
31 |
Karst aquifer |
|
Thin-Bedded Member |
Relatively pure limestone with beds 1.3 to 10 cm in thickness. Limestone beds are separated by thin partings of calcareous shale. |
9 |
Confining unit |
|
Lower Ridley Limestone |
Similar to upper part of the Ridley Limestone |
6 |
No water-bearing zones |
|
Pierce Limestone |
Thinly bedded limestone. Beds average 5.1 cm in thickness. One or more units of massively bedded limestone may be present. Limestone beds are separated by thin partings of calcareous shale as much as 1.3 cm in thickness. |
9 |
Confining unit |
1 From Wilson, 1949.
2 From J.J. Farmer and E.F. Hollyday, U.S. Geological Survey, written commun., 1999.
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