IV-138 



oyster shell deposits are in shallow ombayments such as Galveston Bay, 

 Texas, and Mobile Bay, Alabama. 



Phosphate rock is an important estuarine mineral resource; about 

 75 percent of the total U.S. production is in the estuarine zone of 

 Florida and North Carolina, particularly around Tampa Bay and Pamlico 

 Sound. Considerable deposits of phosphate rock underlie much of the 

 South Atlantic biophysical region, and these may be subject to future 

 exploitation. 



Ocean water is a great reservoir of dissolved minerals, some of which 

 are extracted commercially. Installations in the estuarine zone in 

 California, New Jersey, Texas, and Florida extract magnesium compounds 

 from coastal ocean water and supply the bulk of U.S. production. Large 

 ponds are used in California for the evaporation of saline water to 

 produce commercial salt; many of these have been built in marshes or 

 shallow estuarire waters. 



SHORELINE DEVELOPMENT 



The use or development of estuarine water either depends upon, or 

 governs, land or shoreline use. Examination of some of the purposes 

 of shoreline. development illustrates this relationship. 



Recreational shoreline development is based on potential water use. 

 Recreational facilities included: Marinas which support boating activ- 

 ities; beaches which are necessary for the swimmers; parks that cater 



