Integrated Geophysical Studies Over Buried Valleys

Integrated geophysical studies of four buried valleys have been completed in<br>Southwestern Ohio’. All of the areas have been overridden by two or more Pleistocene<br>glaciers and each valley contains sequences of till, outwash, and lacustrine deposits. This<br>paper summarizes the results of those studies and proposes a strategy for shallow geophysical<br>investigations in glaciated areas. The techniques used in the integrated studies were gravity,<br>magnetics, resistivity, ground penetrating radar, seismic refraction, and seismic reflection.<br>Certain combinations of geophysical techniques can be most cost effective but it is<br>important to clearly define the goals of the study and to understand the existing field<br>conditions before designing the geophysical survey. If only general depth to water table and<br>bedrock are needed and there is essentially no cultural development in the area, electrical<br>methods are inexpensive and fast. If there is no clay and the groundwater is low in mineral<br>content, then ground penetrating radar can be quick and inexpensive.