In exploration for oil and gas, potential fields provide a cost-effective way to explore large areas. Euler deconvolution is an established algorithm to extract features from potential fields. We use an enhancement to the conventional Euler deconvolution process designed to identify lineaments typically associated with faults, fractures, etc. In examining these data, it was surprising to observe circular features, in particular a very large feature in the Texas Panhandle. Since the observed pattern was suggestive of an impact site, known impact craters are examined to look for similar expressions in the gravity field. Gravity measurements are often used in analyzing impact sites due to changes in geology, which can be quite varied and complex. The ability of this process to extract small coherent signals from the data and to operate on large areas makes it a useful tool in identifying impact sites and other large circular features such as salt domes, calderas, etc. All of these types of structures can be of scientific and economic interest. The examination here is focused on impact structures.