This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. Ravinement features detected by observing basal reflectors in seismic records. Units are in meters. Data were collected jointly with the Delaware Geological Survey during August 1993. R/V Discovery, Datasonics Model SBT-220 Sub-Bottom Profiler operated at frequencies of 3. 5and 200 kHzREFS:Conkwright, R. D. , and R. A. Gast. 1994. Potential Offshore Sand Resources in Central Maryland Shoal Fields. Coastal and Estuarine Geology File Report #94-9Toscono, M. A. , Kerhin, R. T. , York, L. L. , Cronin, T. M. , and S. J. Williams. Quaternary Stratigraphy of the Inner Continental Shelf of Maryland. Maryland Geological Survey Report Of Investigations no. 50 Funding to compile these datasets provided by BOEM under cooperative agreement number: M14AC00007. Data processing and compilation was executed by Maryland Geological Survey. Last updated: 8/1/1993