IINCTA.SSTFTF.n 



SECURITY CLASSIFICATION OF THIS PAGErWTian Data Bnterad) 



are clean, fine to coarse quartz sand and silt and clay. Sand appears to pre- 

 dominate in surface deposits and to be the primary constituent of shoals and 

 ridges present in several locales. Silt and clay deposits are the most common 

 subbottom sediment type; clay, gravel, and till-like mixtures of sandy-silty 

 pebbles occur locally. Indurated shale occurs in the area near New Buffalo, 

 Michigan. Results show that the highest potential for sand is in the area 

 between Whitehall and Saugatuck, Michigan. Smaller deposits appear to occur 

 between Manistee and Whitehall, Michigan, and from Saugatuck to 15 kilometers 

 (9.3 miles) south of Benton Harbor, Michigan. The region with lowest potential 

 for sand resources is from Benton Harbor south to Burns Harbor, Indiana, where 

 a thin veneer of sand overlies silt and clay. 



•^ UNCLASSIFIED 



SECURITY CLASSIFICATION OF THIS PAGErlWie 



