6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.76 



Locality 8. — Ledges and bluffs on shore of Lake Michigan, li/^ miles west of 

 Charlevoix, in sees. 28 and 29, T. 34 N., R. 8 W., Charlevoix County, Mich. 



Locality 8a. — Shore of Lake Michigan from locality 8 to about 1 mile south, 

 Charlevoix County, Mich. 



Locality 13. — Main Curtiss quarry, two smaller quarries, and shore bluffs to 

 the west. "Bay Shore quarries." SW. % sec. 6, T. 34 N., R. 6 W., Emmet 

 County, Mich. 



Locality llf. — Petoskey Portland Cement Co. quarry, I14 miles west of 

 Petoskey city line, SW. % sec. 2, T. 34 N., R. 6 W., Emmet County, Mich. 



Locality llfC. — Abandoned quarry one-half mile west of the west end of the 

 Petoskey Portland Cement Co. quarry, (Locality 14a), and about one-eighth 

 mile south of Little Traverse Bay. NW. % of the NE. % sec. 9, T. 34 N., R. 6 

 W., Emmet County, Mich. 



Locality Ike. — Abandoned " Bell " quarry, extreme NE. % sec. 8, T. 34 N., R. 6 

 W., and ledges on shore to west, Emmet County, Mich. 



Locality 18. — Northem Lime Co. quarry, bordering Little Traverse Bay near 

 east end of Petoskey, NE. 14 sec. 32, T. 35 N., R. 5 W., Emmet County, Mich. 



Locality 18a. — Bluffs on shore of Little Traverse Bay at P. M. R. R. sta- 

 tion, Bay View, extreme NW. l^ sec. 32, T. 35 N., R. 5 W., Emmet County, 

 Mich. 



Locality 21. — To right of Highway No. 11 at intersection of P. M. R. R., just 

 east of East Bay View, NE. V^s of the NW. i/4 sec, 34, T. 35 N., R. 5 W., 

 Emmet County, Mich. 



Regional and local structure play equally important parts in the 

 presence and distribution of Traverse strata ; but as a discussion of 

 the deformation is to receive attention under a later heading the 

 direct bearing of these two types of deformation on outcrops only 

 need be mentioned here. To a broad southerly regional dip of 

 indeterminable average intensity is due the appearance on the sur- 

 face of the concentric Traverse belt. Local deformation of small 

 magnitude but extreme complexity has so confused the general atti- 

 tude that it is possible to state only the already well known fact, that 

 to the north lower and lower rocks appear on the surface where 

 the cover of drift has been removed, and that to the southward the 

 Middle Devonian disappears from sight under the younger black 

 shales and later beds to reappear again for the first time in northern 

 Ohio. 



As has been already mentioned,^- a good part of the sequence may 

 be learned from a close study of the more or less continuous ledge 

 exposures on the south shore of Little Traverse Bay, where abundant 

 and varying local doming brings to view now one, now another 

 portion of the section. This method is, however, attended by diffi- 

 culty and uncertainty, especially as regards exact measurement of 

 thicknesses, and since the artificial uncovering through quarry ex- 

 cavation of much of the strata offers a much more ready means of 

 observation, the shore exposures have been used in most cases merely 

 as checks on lateral lithologic and stratigraphic variation. 



" pohl, E. R. Smithsonian Explorations Rept, p. 28, 1927. 



