84 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



I II III IV V 



Ft. In. Ft. In. Ft. In. Ft. In. Ft. In. 



Upper Freeport 5 4 4 4 1 4 2 5 



Interval 44 2 60 G9 53 6 50 



Lower Freeport 5 3 1 2 3 2 3 7 



Interval 43 10 27 6 38 45 4 45 



Upper Kittanning 2 10 2 6 4 5 4 2 7 



Interval 54 9 80 68 \ 



Middle Kittanning 3 8 3 1 8 1 94 4 97 11 



Interval 38 23 22 J 



Lower Kittanning 3 6 4 4 3 3 4 6 



Interval 35 8 22 6 20 33 10 



Clarion 1 8 2 5 2 68 11 



Interval 30 28 3 29 8 



Brookville 5 4 9 1 8 .. .. 3 6 



I. Bennington (d'Invilliers). 

 II. Bens Creek (Prosser and Hardin). 

 III. Sonman shaft (Prosser and Hardin). 

 IV. Sonman borehole (Prosser and Hardin). 

 V. Wilmore borehole (d'Invilliers). 



The Gorman coal bed is in the second, at 46 feet below the Upper Kit- 

 tanning, and in the last a thin coal at 35 feet above the Lower Kittan- 

 ning represents the Middle Kittanning. The Upper Freeport limestone 

 is in the first three, while in the third, which is very near the east side of 

 the basin, one finds for the first time the Johnstown limestone. The 

 Lower Freeport limestone is shown on the southern border of the county. 

 On the western side of Cambria, in the Johnstown subbasin, the Johns- 

 town is the only limestone shown in Mr Fulton's section. It underlies 

 the Upper Kittanning coal directly. The whole series of coal beds is 

 present, but the only prominent sandstone is the Freeport — massive, 

 micaceous, and 21 feet thick.* 



Comparatively few details respecting the Allegheny are available in 

 Somerset south from Cambria. The beds are reached for the most part 

 only in gorges of Laurel hill or the Allegheny where the region is still 

 largely forest. The Brookville and Lower Kittanning were recognized on 

 the Allegheny, 50 to 60 feet apart, with another at 100 feet higher. The 

 Upper Kittanning and both Frecports appear to be persistent in Xegro 

 mountain where the Lower Freeport and Johnstown Cement limestones 

 are present. In the center of the county, near Somerset, the Freeport 

 sandstone is massive and 30 feet thick ; but there only the Johnstown 



* F. Piatt: Blair county (T), p. 95. 

 F. and W. G. Flatt : Cambria (H 2), pp. 3, 4, 40, 41. 61-64, 100. 115. 

 J. Fulton in (H 2), pp. 97-98; Appendix to H 3, p. 867. 

 A. CJ. Prosser and O. B. Hardin : The same. 374, 377, 379. 

 E. V. d'Invilliers : Final Kept., 1895, plate 414, opposite p. 2220. 



