scattered clay outcrops are the most resistent formations in the study 

 area. One of the more extensive areas of actively migrating dunes on 

 the Great Lakes marked the central part of the study area (see Figs. 4 

 and A-2). Examples of shore forms throughout the study area are shown 

 in Figures 12, A-3, and A-4. Shore profiles at each station are shown 

 in Appendix B. A typical nearshore profile is shown in Figure A-5; de- 

 tails of nearshore geometry are described in Hands (1976) . In consid- 

 ering the likely differences in response to high water on two separate 

 beaches, the shape of the nearshore profile may be the single most im- 

 portant comparison, since it reflects aspects of both the level of tur- 

 bulence which the coast is exposed to and the materials of which it is 

 composed. 



Silver Lake 



Figure A-2. Aerial view looking across Little Sable Point 



from Lake Michigan toward Silver Lake. Profile 

 station 14 is in the right foreground. 



Where glacial bluffs are being eroded by direct wave attack, several 

 kilometers north of the study area, gravel and cobbles are prominent on 

 the upper beach. Throughout the study area, however, the beaches are 

 sandy with a mean grain size in the upper 2 centimeters of the swash zone 

 ranging from 1 to 2.5 phi (0.50 to 0.18 millimeter). Longshore trends in 

 mean grain size on the beaches are mirrored by similar trends in the finer 

 sands along the crests of the longshore bars. Additional factors repre- 

 sentative of conditions in the study area, and references to more detailed 

 descriptions are itemized in Table A-3. 



50 



