Raymond: Sections in thk Conemaugh Series. 171 



3. Contorted gray clay and thin-bedded gray shale with many lime- 

 stone nodules. 10 ft 65 ft 10 in. 



2. Soft gray and green clay. 6 ft 71ft. lo in. 



I. Thin-bedded sandstone, bottom not seen. This is the top of the 



Mahoning. 3 ft 74 ft- 10 in. 



It will be noted that the distance between the top of the Mahoning 

 and the base of the Mason coal is 68 feet in both sections. As the 

 Mahoning is at least 50 feet thick in this locality, the estimate of 43 

 feet at Donohoe is probably under, rather than over the true thickness. 



In this locality the Mason shale contains two layers of sandstone 

 and is much more sandy throughout than usual. 



The horizon of the Gallitzin coal would be at the top of number 3, 

 but there is no trace of it in this section. 



Section at the Murrysville Anticline. 



The crest of the next strong anticline west of the Grapeville crosses the 

 Pennsylvania Railroad about half-way between Ardara and Trafford. 

 In straightening the line several long and deep cuts have been made 

 and the strata from a few feet below the Brush Creek limestone to the 

 top of the Birmingham shale are well exposed. The section given 

 here is compiled from measurements made in all the cuttings from the 

 second one east of Ardara to the one just east of the station at Traf- 

 ford. 



Section Along the Pennsylvania Railroad from Ardara to Trafford, Pa. 



20. Gray sandy shale, with lenses of sandstone. Birmingham hori- 

 zon. 47 ft 



19. Coal. Elk Lick horizon. 6 in 47 ft. 6 in. 



18. Gray shale. 6 in 



17. Yellow structureless clay, with great numbers of limestone nod- 

 ules. 12 ft 



16. Thin-bedded red shale. 12 ft 



15. Yellow fissile shale with marine fossils at the base. 10 ft 



14. Shaly limestone with marine fossils. Ames horizon. 3 ft 



13. Structureless red clay. 16 ft loi ft. 



12. Red fissile shale with many small nodules. 29 ft 1^0 h. 



II. Yellow sandstone and shale. 6ft 136 ft. 



ID. Red, green, and gray clay. 8 ft 144 ft. 



9. Red thin-bedded clay-shale. 58 ft 202 ft. 



8. Impure sandy limestone with marine fossils and land plants. 



Pine Creek horizon. 6 in 202 ft. 6 in. 



7. Yellow clay with numerous concretions. 4 ft 206 ft. 6 in. 



6. Thin-bedded red shale. 6ft 212 ft. 6 in. 



