We greatly appreciate the contributions of several individuals who assisted in various parts of this project.  Charles Worley (USGS) operated the CRP and seismic equipment during the survey; Captain Rick Younger and First Mate Joya Blix (MD-DNR) operated the survey vessel, R/V Kerhin; and Laura Erban (ETI Professionals, Inc.) assisted with all field operations. The research was supported by the USGS Coastal and Marine Geology Program and the USGS Chesapeake Bay Priority Ecosystems Program. The manuscript benefited from reviews by Jane Denny, Aaron Turecek, and Brian Andrews.