A Michis-aii Preliminary Section. — Grahait. 
1 79 
STATION, NUMBER AND LOCATION. 
30. Sec. 3, E. line, top of ridge 
31. Town and county line 
^2. Sec. 34, E. line, top of maraine 
3S- Sec. 35, W. line, Rabiteau's farm 
34. Sec. 27, E. line, base of terrace 
35. Sec. 22. E. line running west 
36. Fork of roads 
27. Lake Huron at Bell 
38. Grand lake at Lumber mill. Sec. 15, N. E. corner 
39. 1 op moraine. Grand lake 
40. Grand lake isthmus 
41. Top gravel ridge, Club house 
42. Kaufman's 
43. Lake Huron at Presgue Isle Light 
Of the stations here recorded, Nos. i to 23, and Nos. 27 
to 35, are on the section hne ; the others are either to the east 
or the west of the section Hne. From these data, the acconi- 
panyinf^: profile of the section (plate x,x ) has been con- 
structed. 
From a careful plotting', it appears that Long lake and 
Grand lake lie along the outcrops of shale beds of considerable 
thickness. The valleys of these two lakes, therefore, which 
extend along- the strike of the strata, represent longitudinal 
lowlands, carved by streams of the subsequent type out of the 
softer strata. 
STRATIGRAPHY OF THE SECTION. 
Owing to the extensive drift coverings of this region, rock 
exposures are comparatively rare, and are confined to roadside 
cuttings, quarries and the few natural exposures, which are 
found along the tops of the terraces. From well-records, 
however, we gain a knowledge of the succession of beds, and 
of the thickness of the various members. Taking this as the 
foundation of the stratigraphic work for this region, we may 
attempt a correlation of those beds which crop out on the 
surface, with those recorded in the well. Lithic characteristics 
will have to he relied upon in such a correlation, and for the 
