The subsurface character of Meteor Crater, Arizona, as determined by ground-probing radar

The first results are presented from a ground-probing-radar survey of the subsurface structure of the Meteor Crater (Arizona) and the surrounding ejecta blanket. Five ground-probing radar transects were conducted, including three complete north-south transects of the interior floor of the crater and a partial east-west transect, connecting the three north-south surveys; the fifth transect was exterior to the crater. A number of subsurface dielectric reflectors were identified in both the interior and exterior transects of the Meteor Crater. The depths of most of these reflectors in the interior transects corresponds to lithological boundaries known from previous data from drilling and shaft excavations. However, some of the reflectors, e.g., the horizontal reflectors within the allochthonous breccia lens, were not known from previous work.