distribution pattern. Poorly sorted fine quartz sands (Type F) mantle the entire shoreface 

 from Georgia to Cape Canaveral. The shoreface extends out to depths of 45 to 55 feet, 

 usually within 1 to 2 nautical miles of the shoreline. Seaward of this zone type A 

 moderately well-sorted fine to coarse quartz sands are dominant (shown as inner shelf facies 

 in Figure 27). Tliis relatively uncomplicated distribution pattern is typical of the inner shelf, 

 but along the reconnaissance line between Cape Canaveral and St. Augustine, surface 

 sediments generally display more variation than to the north. 



Surface occurrence of sediments between the Georgia border and Flagler Beach is 

 sliown in Figure 26. Tlie shoreface facies type F (fine poorly sorted quartz sand) is common 

 only within the generally narrow shoreface zone and the adjacent innermost shelf floor; 

 fartlier seaward type A sands are dominant. Tliis is particularly well illustrated by cores 

 collected along the reconnaissance line between Fernandina and Jacksonville. The 

 anomalous appearances of medium sand on the shoreface are adjacent to St. Marys River 

 Entrance and St. Joluis River Entrance and are probably related to inlet influence. Areas of 

 outcropping Tertiary sediments are indicated by the residual facies. These locations are 

 restricted to the southeast corner of the Fernandina grid and two locations in the 

 Jacksonville grid. Seismic reflection profiles indicate that there are probably more exposures 

 in this area tliat were not sampled. 



Few cores were collected from the slioreface along the reconnaissance line between 

 Jacksonville and St. Augustine; hence, there are little data to provide accurate 

 documentation of the distribution of a shoreface facies in this region. Most cores from the 

 region contain thick sequences of inner shelf type A sand, and surface outcrops of 

 underlying strata do not occur. The surface distribution and thickness of type A sand can be 

 directly related to the complex bottom morpholog} and probably represent a large potential 

 sand reserve. Adjacent to St. Augustine Inlet, type A sediments are distributed over a large 

 region, probably as a result of tidal transport near the inlet. Type F deposits are generally 

 limited to within 2 nautical miles of tlie shoreline, which may in part be related, since tlie 

 shoreface is steeper and more narrow in tliis area than it is farther north. South of 

 St. Augustine the shoreface narrows to about 1 nautical mile in widtli and the seaward toe 

 lies at -50 feet MLW. 



Because of the lower densit)" of data coverage relative to the gridded survey areas to t!ie 

 nortii, sediment patterns between St. Augustine and Cape Canaveral are interpreted with less 

 reliabihty. Most landward cores contain fine poorly sorted sands at the top (Type F), and 

 seaward cores contain medium sands (Fig. 28). Several subsurface units lie near the surface 

 and exhibit some influence on sediment cliaracter and although most sediments are 

 identified as types A or F, there are variations. In addition, tlie spatial distribution of 

 sediments (Sec. IV) indicate that the simple distribution pattern of type F deposits on the 

 shoreface, and of type A seaward of tlie shoreface, is tlie result of a complex succession of 

 strata. 



57 



