Powars, David S. <br/><br/>
The effects of the Chesapeake Bay impact crater on the geologic framework and the correlation of hydrogeologic units of southeastern Virginia, south of the James River / by David S. Powars. 

 - Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by U.S. Geological Survey, Information Services,  2000 
 - iv, 53 p. : ill. (some col.), maps (some col.) ; 28 cm. 
 - U.S. Geological Survey professional paper ; 1622 .
<br/><br/> One folded p. of ill. on inside back cover. Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0607936932 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptoexplosion structures -- Chesapeake Bay (Md.and Va.)<br/>Geology, Structural -- Virginia.<br/>Hydrogeology -- Virginia.