350 ■ The American Geologist. juuc, i89o 
from a depth of 105 feet. To the southwest of this,at a depth of 
300 feet, a calcareous shale referred to the Cincinnati group 
has been found. 
The next county in order, Kankakee, is crossed in its south- 
west portion. The Cincinnati group outcrops at the county 
line for about ten feet, having risen from 300 feet below the 
surface in the county to the east. In a boring made in Otto 
township, a little to the north of our line of section, the Niag- 
ara was 388 feet thick, this being the depth at which the Cin- 
cinnati rocks were found, while the group itself was 213 feet in 
thickness. 
At Wilmington, in Will county, just north of Kankakee, 
"there is from fifteen to twenty feet of this (Cincinnati) group 
exposed in the bluffs of the Kankakee. The lower part is an 
irregularly bedded argillaceous limestone, which passes up- 
ward into green shales, with thin bands of limestone. Bhyncho- 
nella capax is very abundant here, in addition to most of the 
species observed at Oswego."^'' 
Grundy is the county next west of Kankakee, and here 
again the Coal Measures predominate. A well at Morris 
found the Cincinnati group about seventy feet, (69 ft. 10 in.), 
below the Coal Measures, the intermediate formations being 
absent. The Cincinnati group itself was 100 feet thick. On 
the Kankakee river only 50 feet of shales and sandstones in- 
tervened between the surface and the Cincinnati group, while 
in other places the overlying rock is only 20 feet in thickness. 
In the northeast corner of the county the Cincinnati rocks 
occupy the north half of the bed of Goose lake, while the Coal 
Measures occupy the south half. The fossils found in the 
outcrops in the county are of such common species as Chse- 
tetes lycoperdon, Pleurotomaria [ Cydonema] bilix, Orthis testu- 
dinaria, Leptsena sericea, Ambonychia radiata, Calymene calli- 
cephala, etc. At Minooka the boulder clay lies 100 feet thick 
upon the rocks of this age. 
Kendall county lies immediately north of Grundy. At Os- 
wego, in this county, the junction of the Cincinnati group 
"with the overlying Niagara limestone is well exposed, and 
also from eighteen to twenty feet in thickness of the upper 
part of this group, [Cincinnati]. The upper six feet of the 
latter, at this locality, is a regularly bedded gray limestone, 
^♦Geology of Illinois, vol. 1, pp. 138, 139, 1866. 
