GROUND WATER IN NORTH-CENTRAL TENNESSEE
GROUND WATER IN NORTH-CENTRAL TENNESSEE
GROUND WATER IN NORTH-CENTRAL TENNESSEE
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54 <strong>GROUND</strong> <strong>WATER</strong> <strong>IN</strong> <strong>NORTH</strong>-<strong>CENTRAL</strong> <strong>TENNESSEE</strong><br />
LOWER ORPOVICIAN SERIES<br />
LEBANON LIMESTONE "<br />
The Lowville limestone is underlain disconformably by the Lebanon<br />
limestone, the type locality of which is the city of Lebanon,17 Wilson<br />
County. The Lebanon limestone generally comprises many beds of<br />
compact brittle light-gray, dove-colored, or bluish-gray limestone in<br />
alternation with thin seams of bluish-gray or yellow clay. The layers<br />
of limestone are from 1 to 6 inches thick, and those of clay only a<br />
fraction of an inch. Some of the limestone beds are sandy, others<br />
are laminated, and still others are mottled; some layers are dense and<br />
unfossiliferous, others are coarsely crystalline; furthermore, the beds<br />
show ripple and rill marks at many different horizons. At many<br />
places a massive bed of drab coarsely crystalline unfossiliferous lime<br />
stone from 2 to 11 feet thick, very similar lithologically to the under<br />
lying Kidley limestone, occurs in the lower half of the formation.<br />
The Lebanon limestone is fossiliferous at many horizons, although<br />
some beds are barren and others are composed almost entirely of the<br />
shells of one or several species. The most abundant and character<br />
istic fossils of the formation are<br />
Plectambonites sp.<br />
Scenidium anthonense.<br />
Batostoma libana.<br />
Escharopora briareus.<br />
Leperditia fabulites.<br />
Orthis tricenaria.<br />
Phragmolites grandis.<br />
Pianodema subaequata.<br />
Pachydictya cf. P. foliata.<br />
Pterygometopas troosti.<br />
Rhynchotrema minnesotensis.<br />
Chasmatopora sublaxa.<br />
Streptelasma cf. S. parasiticum.<br />
Zygospira saffordi.<br />
The Lebanon limestone ranges in thickness from 80 to 125 feet and<br />
in general thins westward. It crops out in a band from half a mile to<br />
5 miles wide along the base of the hills that bound the Nashville<br />
Basin peneplain in Rutherford County. It also covers extensive<br />
areas in Davidson, Williamson, and Wilson Counties. (See pi. 4.)<br />
The generalized form of its outcrop is an elliptical band surrounding<br />
the Nashville dome. (See pp. 62-63.) The formation is not known to<br />
crop out in the Wells Creek Basin of Stewart County. (See p. 191.)<br />
RIDLEY LIMESTONE<br />
The thin-bedded Lebanon limestone is underlain, in seeming con<br />
formity, by the Ridley limestone, the type section 18 of which extends<br />
half a mile southward from the Davis mill (formerly Ridley's mill),<br />
i* This discussion of the Lebanon limestone and the underlying formations of the Stones River group is<br />
adapted in large part from Galloway, J. J., Geology and natural resources of Rutherford County: Tennessee<br />
Geol. Survey Bull. 22, pp. 32-45,1919.<br />
w Saflord, J. M., and Klllebrew, J. B., The elements of the geology of Tennessee, p. 125, Nashville, Poster<br />
6 Webb, 1900.<br />
w Saflord, J, M., The geology of Tennessee, p. 261,1869.