Type E material is the most widely distributed o£ all sediment types 

 in the Fort Pierce grid area. It occurs at the surface in many places, 

 usually on the outer shelf. The pattern of occurrence and its association 

 with the blue reflector strongly suggests that this material continuously 

 underlies the entire grid area. 



Among the unclassified sediments a number contain quartzose sand. 

 These samples are all from shoreface cores, and possibly represent mate- 

 rial winnowed from the quartzose deposits of the present beach. Shells 

 of mollusks, particularly Crepidula fornicata and Mulinia lateralis , are 

 mixed with the sand matrix, but the sand fraction itself contains little 

 carbonate material. This sediment is designated UI in Appendix C. 



Most of the remaining unclassified samples are silty, cohesive, very 

 fine sands which do not appear to be restricted to any particular area or 

 stratigraphic position. They are possibly localized deposits of fine 

 material winnowed from overlying or adjacent units and are designated U2 

 in Appendix C. 



c. Reconnaissance Areas - Almost all cores taken on the Fort Pierce- 

 Cocoa Beach reconnaissance lines contain gray, silty, clayey material in 

 the upper layers. Varying amounts of shell are mixed with the silt-clay 

 matrix; generally shell increases in size and density with depth. In some 

 respects this material resembles Type D material. In most places, it is 

 underlain by a light tan to white calcareous clayey unit containing many 

 broken shell fragments, some of which are chalky and very friable. When 

 dry, this material is extremely hard. 



No material closely resembling Fort Pierce type sediments is contained 

 in these cores from the reconnaissance area. It is thought significant 

 that the disappearance of Type A material coincides with the disappearance 

 of shoals in the inshore area, and (with the exception of Thomas Shoal) 

 from the offshore area. The relationship of this sediment type and surface 

 topography appears to be close. 



Cores north of about 28°10'N (Canaveral Bight) indicate that the 

 Bight area is blanketed with a deep deposit of relatively uniform clayey 

 silt containing few shells. This deposit probably forms the shallow inner 

 level of the 50-foot flat in Canaveral Bight. The fineness of the mate- 

 rial suggests it has been deposited in a low energy environment created 

 by Canaveral Peninsula and its off- lying shoals. 



Core 181, which penetrated material differing from that found in 

 other cores of the reconnaissance area, contains the only sand potentially 

 usable for beach fill. A layer of quartzose, medium-to-coarse sand with 

 varying amounts of shell fragments in the upper and lower parts of the 

 core appears to be suitable for fill. A thin layer of clayey sand con- 

 taining woody material overlies the first quartzose layer. The extent, 

 form and orientation of this deposit cannot be determined from available 

 data. It is, however, a promising place for further investigation, should 

 offshore sand supplies be needed in the general vicinity. The lower part 



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