00982nam a2200193Ia 450000100070000000500170000700800410002402000050006504000100007008200220008010000330010224502720013526001450040730000350055250400510058765000730063865000350071165000420074625120720160527185941.0010912e        xxu    gr     000 0 eng d  c  aPUCPR00222a557.55bP881e1 aPowars, David S.     2Local14aThe effects of the Chesapeake Bay impact crater on the geologic framework and the correlation of hydrogeologic units of southeastern Virginia, south of the James Rivercby David S. Powars ; prepared in cooperation with the Hampton Roads Planning District Commission.   aReston, Va.bU.S. Dept. of the Interior, U.S. Geological SurveyaDenver, CObFor sale by U.S. Geological Survey, Information Servicesc2000.  aiv, 53 p.bill., mapsc28 cm.   aIncludes bibliographical references and index. 0aCryptoexplosion structureszChesapeake Bay (Md. and Va.)     2Local 0aHydrogeologyzVirginia.2Local 0aGeology, StructuralzVirginia.2Local