KENDALL COUNTY. 139 



Niagara Group. This formation, judging from the outcrops, occupies a con- 

 siderable area in the northern and northeastern portion of the county. From, 

 the scarcity of outcrops, however, it is difficult to bound this area with exact- 

 ness, the junction between it and the next, being only seen on the Fox river at 

 Oswego. Its southern border may be approximately represented by a line 

 entering the county in the northeast corner of section 18, township 37, range 

 6, and running in a direction a little south of east, to the Fox river, at Oswego, 

 then bearing gradually more and more to the southward, until it leaves the 

 county in the southeastern corner of township 36, range 8. The general direc- 

 tion of this border line of the formation, is inferred from widely separated 

 outcrops, some of them outside of the limits of Kendall county. 



At Esq. Shontz's quarry, on Big Rock creek, near the centre of the southern 

 half of section 1, township 37, range 6, about twelve feet of the regularly bed- 

 ded light buff, or drab limestone of this group is exposed. It here contains 

 much chert in irregular seams and concretions, especially in the lower part of 

 the exposure, the upper two or three feet being almost entirely free from this 

 substance. Above the quarry, at the milldam,this rock forms the bank of the 

 creek, in ledges rising some seven or eight feet above the water, and may still 

 be seen above water for about thirty rods above the dam. Farther up stream, 

 the rock continues under the bed of the creek to beyond the county line, but is 

 not again exposed in the bank in this county. Below the quarry, it appears in 

 the bed of the creek for between a quarter and a half a mile, before finally dis- 

 appearing entirely, and at several points within this distance, there are limit- 

 ed exposures in the banks. In none of these exposures is there any noticeable 

 dip of the strata, and the level surface of the upper beds in the quarry, is cov- 

 ered with the glacial strise, which have been already mentioned in the preced- 

 ing pages. Fossils are not abundant in any of these localities, but Holy sites 

 catcnularia, Favosites favosus, Calymene Blumenbachii, an lllsenus, and a few 

 other species were collected. 



Eastward from this point, no prominent exposures or ledges of rock are met 

 with, until the Fox river is reached. At the point where the river crosses the 

 Kendall county line, just below the village of Montgomery, a ledge of yellowish 

 limestone containing much chert, appears on the right bank of the river, rising 

 to a hight of seven or eight feet above the water's edge. From this point 

 down stream nearly to Oswego, there is very little exposure, the rock appearing 

 only below high water mark, and in the bed of the stream. Just north of the 

 village, near the southern line of section 8, township 37, range 8, the thin bed- 

 ded limestone of this group is quarried in the bottom and sides of a small ra- 

 vine. The lower eight or ten feet of the rock, which is quarried near the river 

 bank, is mainly of a light buff color, with some portions of the strata approach- 

 ing to gray, and with a few thin seams of bluish cherty rock very nearly resem- 



