Fernandina 

 Grid 



Jacksonville 

 Grid 



Explanation 

 Core Location 

 Location of Cores Conto 

 Tertiary Sediments 



Figure 29. Map of the Georgia border to Jacksonville area showing relationship between depth to first sonic reflector and 

 locations of cores bearing Tertiary sediments. Depths to first reflector, or overburden thickness, is indicated by 

 Zip-a-tone patterns. Note close association of cores containing Tertiary-age material (X's) witli seismic data 

 showing areas of thin ( < 10 feet) overburden. Shore-normal profile lines in each grid give locations of lines 

 shown in subsequent figures. 



62 



