1887

Abstract

Gravity was measured at 173 stations in 30 km of profiles near Middletown in central Indiana to<br>map the Anderson bedrock valley and direct test drilling to the deepest part of that valley. The valley fill<br>includes coarse-grained aquifers and fine-grained aquatards of lakebed sediments and tills that overlie<br>Silurian and Ordovician strata dominated by carbonate rocks. Available maps derived from seismic<br>refraction profiles and scattered water, oil, gas, and test wells have generally provided insufficient detail<br>to suitably locate test wells. Two test wells were recently drilled at sites adjacent to relative gravity<br>minima in the profiles of the present survey. These wells penetrated the bedrock surface near the<br>thalweg of the Anderson bedrock valley at elevations of 175 to 176 m above sea level or about 23 m<br>deeper than was previously penetrated by wells in the area. The maximum thickness of unconsolidated<br>strata is about 120 m. Seismic refraction records were reinterpreted using hidden layers and dipping<br>bedrock refractors.

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/content/papers/10.3997/2214-4609-pdb.186.00_addendum
2004-02-22
2024-03-28
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