radiocarbon age of about 11,000 years (Emery et 

 al., 1966, 1967). 



The fourth band (33^0 fm.) is marked by 

 several terrace remnants, some with extensive bars 

 and lagoons. For example, the foot of Fortune 

 Scarp (northeast of the Hudson Delta) lies at 

 about 37 to 38 fm. and the foot of Tiger Scarp at 

 about 33 to 36 fm. (chart 0807N-52). Garrison 

 and McMaster (1966) also noted that a significant 

 percentage of what appear to be Holocene ridge 

 tops south of New England are at depths of 34 to 

 39 fm. and an old fresh-water peat deposit lias 

 been discovered at 36 fm. just south of the mapped 

 region (Emery et al., 1967). This peat has a radio- 

 carbon age of 13,500 years. 



ACKNOWLEDGMENTS 



J. Lockwood Chamberlin of the Bureau of 

 Commercial Fisheries encouraged me to write this 

 report. Charles B. Hitchcock, American Geo- 

 graphical Society, and Harris B. Stewart, Jr., and 

 Lome Taylor, both of ESSA (Environmental 

 Science Services Administration), provided in- 

 terest and support for publication of the maps. 

 John M. McAlinden and Charles E. Wittmann, 

 both of ESSA, contributed much to the final design 

 of the published maps. John A. Knauss, Robert 

 L. McMaster, and Louis E. Garrison, all of the 

 Narragansett Marine Laboratory, University of 

 Rhode Island, made Garrison's bathymeti-ic com- 

 pilations available. John S. Schlee, of the LT.S. 

 Geological Survey, and Anita J. Mondale reviewed 

 the manuscript. Janet A. Tippett made the 

 reliability computations. 



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BATHYMETRIC MAPS AND GEOMORPHOLOGY OF MIDDLE ATLANiTIC CONTINENTAL SHELF 



61 



