280 



Clara Gould Mark 



taken from Mr. Wm. Jones' drift which is just north of the Flint 

 Ridge road, and about one-quarter of a mile from the western 

 boundary of Hopewell township. The following section was 

 measured at this place, leveled from an old coal drift a few rods 

 northwest of the Wm. Jones drift : 



THICKNESS 



TOTAL 



THICKNESS 



13. 



12. 



11. 



10. 

 9. 



5. 



Flint in the road at the west end of the ridge in the 

 edge of the woods. 



Covered interval. 



Light gray to white coarse-grained, micaceous sand- 

 stone, friable and largely quartz. Partly covered. 



Covered interval. 



Black tough shale, no fossils seen. 



Top of Mercer Limestone. A layer of impure dark 

 gray or bluish gray limestone containing many fos- 

 sils, but the majority of them poorly preserved 

 and fragmentary. When the rock is weathered the 

 lime leaches out, leaving the rock buff or brown 

 in color and much lighter in weight. 



Blue or bluish black limestone, fossils abundant and 

 well preserved. In fresh exposures the limestone 

 consists of massive layers with shaly partings. 

 The upper layer of limestone is If feet thick. 

 When weathered the limestone becomes shaly and 

 is easily split up, and the fossils are readily ob- 

 tained. 



The lower part of the limestone and the underlying 

 coal could not be measured at this drift, but there 

 appears to be about four feet more of the lime- 

 stone before the coal horizon is reached. 



Soft coal, bituminous and with slickensidos. Wm. 

 Jones' coal drift. 



Fire clay containing a considerable amount of sand; 

 heavy and hard on fresh exposure, but soon weath- 

 ers soft and falls. In many places this shows 

 slickensides. 



"Bony" coal. 



Cannel coal with conchoidal fracture. This is said 

 by one of the miners to thin toward the west 

 to two feet and to thicken toward the east to six 

 feet. 



. Black shale with Lingula tighti Herrick. 



Feet 



3-34 



Feet 



20i 



in 



