1OO STRATIGRAPHY GENERAL SECTIONS. 



Thickness Total 



Feet. Feet. 



Coal, Upper Kittanning 2 1146 107' 



Slate and shells (8%" casing, 663') 40 1186 



Sand, lower division of Lower Freeport 57 1243 



Slate 12 1255 



Sand, Clarion 29 1284 



Pottsville Series (782') 



Slate and shells 409 1693 



Sand, Salt (oil show, 1200'; gas, 1240') 101 1794 



Slate and shells 99 1893 



Sand, Salt, (gas, 1406'; oil, 1434') 70 1963 



Sla.te and shells (6%" casing, 1464') 41 2004 



Sand, Salt, (gas, 1495') 15 2019 



Slate and shells 25 2044 



Sand, Salt 22 2066 920 



Mauch Chunk Series (72') 



Slate and shells 18 2084 



Red rock 15 2099 



Slate and shells to bottom . 39 2138 



SUMMARY. 



For convenience of reference, the thickness of the 

 stratified rocks in Lewis and Gilmer, as determined by 

 the sections in this Chapter, is compiled in the following table, 

 which shows not only the thickness of the various Series but 

 also gives the totals for the Pennsylvanian, Mississippian and 

 Devonian Rocks. A line of dots under a series indicates that 

 the series was not exposed where the section was made. A 

 question mark indicates that the series was present but the 

 line of division between it and the one overlying or under- 

 lying it could not be obtained. In some instances, a section 

 shows a thickness of a series either too great or too small, 

 owing to the dip of the measures where it was made, but 

 these discrepancies are slight because great care was exer- 

 cised to make sections on the strike, if possible. In many 

 cases the sections show only part of a series where, the re- 

 mainder was not exposed. An explanation accompanies each 

 section, where published in full, that gives the peculiar con- 

 ditions under which it was made : 



