103 in the Cedar Point area were analyzed using a visual accumulation tube (U.S. 

 Interagency Committee on Water Resources, 1958; Guy, 1969); 134 samples with more 

 than a trace of silt or clay were analyzed by the pipet method (Folk, 1974) . 

 All these data are included in Appendix B. 



III. SAND DEPOSITS 



1. Introduc tion . 



The vibracore and seismic reflection data obtained during this study (in 

 addition to the reports of known sand and gravel deposits by the Beach Erosion 

 Board, 1952, and by Hartley, 1960) indicate that sand in sizable quantities is 

 present in at least four areas. The areas (Fig. 12) are divided into two large 

 deposits and two small deposits. The large deposits, Fairport Harbor and Lorain- 

 Vermilion, consist of reasonably thick, relatively deepwater deposits whose areal 

 extents are generally well defined; the small deposits at Cedar Point and Maumee 

 Bay consist of fine-grained, shallow-water deposits which are close to shore. 

 Pertinent information on the large deposits is shown in Table 2. 



MICHIGAN 



Sandusky 



Figure 12. Location of sand and gravel deposits in study area. 

 Table 2 . Sand volume summary . 



Fairport Harbor 









Mean 







Water depths 



Cores 



thickaess 



Est. volume 





(m) 





(m) 



(x lO^rn^) 



Area A 











Upper zone 



7.3 to 20 



57.58,60,63, 











64,67,68,69 



2.5 



82 



Lower zOae 



7.3 to 20 



Same cores as 











upper zone 



1.5 



52 



Area B 



7.3 to 13.7 



59 



1.5 



12 

 otal 146 



Lorain-Vermilion 





11 to 14.6 



87,89,90,91, 











92,93,94,97 



See Fig. 17 



32 



22 



