and bench mark locations, are given in Figures 6 to 22 in Davis, Fingleton, 

 and Pritchett (1975) . Table 1 of this report gives the location of the 

 profile line as a whole, which may cover more territory than the bench 

 mark locations in Davis, Fingleton, and Pritchett (1975). 



Bluffs and terraces landward of the beaches are composed of moraines, 

 till plains, outwash, lake beds, and dunes (Fig. 1) with the latter being 

 most widespread. The beach and nearshore zones are composed primarily of 

 sand with scattered gravel at most locations; however, there are a few 

 sites where gravel is dominant. There are also a few sites where glacial 

 till was temporarily exposed on the lake bottom in the surf zone or on the 

 beach. This and other data (Davis, 1970), indicate that the thickness of 

 the beach sand prism over the Pleistocene "bedrock" is quite thin. Resis- 

 tivity surveys at several locations have shown the thickness to range from 

 3 to 10 feet at most of those sites where data are available. 



Although the eastern Lake Michigan coast has a general north-south 

 orientation, the orientation of the shoreline at the 17 profile sites 

 (Fig. 1) is from N. 25° W. to N. 43° E., a range of 68°. The most promi- 

 nent large-scale features are Point Betsie (profile site 1) , Big Sable 

 Point (profile site 4) and Little Sable Point (profile site 6) , all of 

 which occur in the northern part of the study area. Azimuths of each pro- 

 file are given below: 



Profile site 



Azimuth 



1 



288° 



2 



281° 



3 



250° 



4 



277° 



5 



265° 



6 



277° 



7 



252° 



8 



246° 



9 



245° 



10 



259° 



11 



270° 



12 



280° 



13 



277° 



14 



295° 



15 



305° 



16 



296° 



17 



317° 



The composition and morphology of the 17 profile sites reflect the 

 varied nature of the eastern coast of Lake Michigan. There is no large 

 sector of the coast which can be properly categorized into a specific 

 type. Active dunes, stabilized dunes, till bluffs, or lake beds adjacent 

 to the beach are found in all parts of the coast. As a result, the deter- 

 mination of a cause or causes is complicated by the general lack of uni- 

 formity of the coast in essentially all respects. Active dunes may be 

 only a few tens of feet above lake level such as at Point Betsie or may 



