WARREN COUNTY. 299 



the northern part of township 11, range 3, also in the northwest part of town- 

 ship 11, range 2. From Rockwell's mill for several miles up Cedar creek, the 

 outcrops of these beds form mural, or overhanging bluffs, from thirty to forty 

 feet high. Notwithstanding the immense quantities of stone taken from this 

 region, these vast ledges appear to have been but slightly worked at a few points. 

 These outcrops are not on Cedar alone, but along all the branches that enter 

 it in this vicinity. Nearly all the rock is light colored, some portions being 

 tinged with a light shade of buff, and others with blue. It is -compact and 

 dresses well, and some of the layers afford a stone susceptible of taking a good 

 polish. 



The sandstones of the Coal Measures furnish a large amount of valuable 

 building rock, and the most extensive quarries are in Greenbush and Berwick 

 townships. The most important quarries in Greenbush, township 8, range 1, 

 are located along Nigger creek in sections 14 and 15. The following section 

 will show the thickness and relative position of the beds : 



FEET. IN. 



1. Coal, No. 2 of the Illinois section 1 6 



2. Fire clay * 3 



3. Clay shale 11 



4. Coal and black slate 8 



5. Clay shale from 1 foot 6 in. to 2 6 



6. Sandstone 1 6 



7. Clay shale from 20 ft. 2 in. to 22 



8. Sandstone or shale " 3 ft. 9 in. to 7 



The quarries are in No. 8 of this section, and the rock is from five to seven 

 feet thick where worked. 



The most important quarries in Berwick, township 9, range 1, are in sec- 

 tions 14 and 15, along Slug run, and in sections 18 and 20, on Cedar Fork. 

 The sandstone is much thicker here than in Greenbush, it being from twelve 

 to fourteen feet thick, and in some places more. I was unable to ascertain the 

 position of the strata in which those quarries are, but it may be the same as 

 No. 8 of the last section. 



i In section 11, the sandstone forms immense ledges, which in some places 

 overhang the water ten and fifteen feet. " Rock House," as it is called, is in 

 this section, and was formed in some past time, when the bed of the stream 

 was considerably higher than at present, by the water cutting a passage through 

 a portion of the lower strata. In the denuding process, a large pillar of sand- 

 stone was left, and now supports the outer edge of the upper strata, which 

 forms the roof. 



In some localities along Slug run, this sandstone is of little value, as it 

 crumbles to pieces by exposure to the weather. The quarry stone is quite soft, 

 splits readily and dresses easily, and may be obtained in large blocks. In 

 some of the quarries, there is a bluish calcareo-arenaceous rock, hard and 



