OPEN-FILE REPORT 92


 Geomorphology

 Several relict Neogene coastal terraces, which developed as a result of fluctuating sea
levels, have been documented in the study area. Healy (1975) recognized seven marine terraces
within the study area (Figure 4): the Silver Bluff terrace at elevations of between 1 and 10 feet
(.30 meters to 3.0 meters) above mean sea level (MSL), the Pamlico terrace at elevations
between 10 and 25 feet (3.1 meters and 7.6 meters) above MSL, the Talbot terrace at elevations
between 25 and 42 feet (7.6 and 12.8 meters) above MSL, the Penholoway terrace at elevations
between 42 and 70 feet (12.8 and 21.3 meters) above MSL, the Wicomico terrace at elevations
of 70 to 100 feet (21.3 to 30.5 meters) above MSL, the Sunderland/Okefenokee terrace at
elevations between 100 and 170 feet (30.5 and 51.8 meters) above MSL, and the Coharie terrace
at elevations between 170 and 215 feet (51.8 and 70.5 meters). Detailed discussions and
correlations of these marine terraces and relict shorelines have been attempted by many authors,
including Matson and Sanford (1913), Cooke (1931, 1939), Flint (1940, 1971), MacNeil (1950),
Alt and Brooks (1965), Pirkle et al. (1970), and Healy (1975).


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Figure 4. Terraces in Florida (after Healy, 1975).


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