164 STRATIGRAPHY THE ALLEGHENY SERIES. 



the coal is shown in the Cleveland Section, being 3' 7" thick. 

 In Chapter XI, a discussion of its areal extent, thickness and 

 character, together with numerous detailed sections, will be 

 presented, under the subject of "Coal." 



THE LOWER KITTANNING COAL. 



The Lower Kittanning Coal, named "Kittanning" by the 

 First Geological Survey of Pennsylvania, and later termed the 

 "Lower Kittanning" by Prof. Lesley, belonging under the 

 Lower Division of the Lower Freeport Sandstone, and about 

 100 feet below the Upper Kittanning Coal, is the most persis- 

 tent seam in southern Lewis and contains a large amount of 

 coal, but its section is variable, having frequent slate and 

 shale partings that impair its value greatly. Its outcrop is 

 shown on Map II. A discussion of its areal extent, thick- 

 ness and character, together with such detailed mining sec- 

 tions as are available, will be presented in Chapter XI, under 

 the subject of "Coal." 



THE CLARION SANDSTONE. 



The Clarion Sandstone of the Pennsylvania geologists 

 was not definitely recognized above drainage in southern 

 Lewis where its horizon outcrops, and it seems to be absent 

 in that region as the Lower Kittanning Coal comes almost 

 directly above the Homewood Sandstone. In Chapter IV, 

 however, the Clarion is recorded in the sections for Alum 

 Bridge, Camden, Rosedale, Sand Fork, Stouts Mills and 

 Stumptown, showing that it is evidently present in some 

 portions of the two counties. 



