15
Evaluation of the geologic well logs indicate that the geology underlying the village is
comprised of an interbedded sequence of clay, clayey silt, silt, sand and gravel
overlying bedrock comprised of Silurian Dolomite. Figure 6 illustrates the lithology9
index of the geologic materials used in the cross sections.
Figure 6. Lithology Index Used for the Cross Sections
These units collectively form five hydrostratigraphic units identified as: 1) Upper Aquifer
(yellow to light brown), 2) Upper Till10 Aquitard11 (dark reddish brown), 3) Deep Aquifer
(yellow to light brown), 4) Lower Till Aquitard (dark reddish brown), and 5) Silurian
Dolomite Aquifer (blue).
The cross sections and 3-D model show these 5 hydrostratigraphic units. The private
drinking water system wells used to construct the cross sections are also shown in the
same illustration and are labeled with their respective PIN. In general, the bottom of the
well represents where groundwater is being obtained. It appears that the majority of
wells are obtaining groundwater from the Deep Aquifer in Figures 7 and 8.
9 “Lithology” means a description of the physical characteristics (such as color, texture, grain size, or
composition) of a rock unit visible at outcrop, in hand or core samples or with low magnification
microscopy.
10 “Till or glacial till” means unsorted glacial sediment. Glacial till is that part of glacial drift which was
deposited directly by the glacier. Its content may vary from clays to mixtures of clay, sand, gravel and
boulders.
11 “Aquitard” is a bed of low permeability along an aquifer.
