KENDALL COUNTY. 145 



Below this place for some distance the strata of this age are met with and 

 are doubtless tilted up by a small anticlinal, the crest of which has most probably 

 been eroded away. The evidence of this fold is in the existence of an exposure 

 of the underlying St. Peters sandstone on the opposite side of the river in the 

 southeastern quarter of section seventeen, and above the next exposure of the 

 Trenton group, and not by any decided dip of the strata in any direction. 



One mile above Milford, on the right bank of the river, is Brodie's quarry, 

 where a thickness of over twelve feet of the rock is exposed, a bluish-gray porous 

 limestone, the lowermost beds the darkest in shade of color. This exposure is 

 on the northeastern slope of still another anticlinal than that one before men- 

 tioned, the strata having an inclination of between twelve and fifteen degrees 

 in the direction north 60 east. This is further proved by exposures of St. 

 Peters sandstone along the river bluffs immediately below this point. Imme- 

 diately above, at the edge of the water, the limestone may be seen for a short 

 distance, the beds becoming less inclined and finally appearing nearly horizontal. 

 Still farther down the river, below this fold, nearly on the north line of section 

 thirty, and between one-fourth and one-half a mile above Milford, on the right 

 hand bank, I observed the following section : 



FEET. IN. 



1. Coarse porous yellowish limestone 3 6 



2. Hard silicious rock, resembling quartzite 6 



3. Light gray or drab argillaceous shales, with thin layers of rock, same as No. 2 26 



4. Light colored shaly bed 2 to 4 



5. Impure yellowish limestone 3 " 5 



The arrangement of the strata in this exposure is very irregular, and their 

 order is somewhat changed, even within a distance of only a few feet from the 

 point where this section was taken. I am at present inclined to consider these 

 beds, as very near the base of the Trenton, close to the junction with the St. 

 Peters sandstone, and possibly indicating something like beds of passage 

 between the two formations. 



The remaining outcrops of this group in this county, are to be found in the 

 southern part of township 35, ranges 7 and 6. The westernmost of these occurs 

 on the land of Mr. J. Bushnell, in the northeast quarter of section 36, town- 

 ship 35, range 6, a little over half a mile south of the village of Lisbon. The 

 rock is exposed in the bed of a small rivulet at two points, about a quarter of a 

 mile apart. The most southern of these exposures, is of a soft, brown, porous, 

 decomposing limestone; in the other, the rock is harder, and contains consider- 

 able chert. A fragment of a Recept acuities, and one or two other indistinct 

 casts of fossils only, were collected here. The next nearest exposure is at 

 Morris's stone quarry, the southeast quarter of section thirty, township 35, 

 range 7, where the rock appears at the surface of the ground on one of the 

 19 



