Williams.] WHITE ON THE PENNSYLVANIA CONGLOMERATES. 109 



In Report QQQ, 1880, the following are the chief members of the 

 Conglomerate Measures (chapter v) as they appear in Mercer County: 



Home wood sandstone. 



Upper Mercer Iron Ore shales. 



Mercer upper limestone (=='* Mahoning sandstone," Rogers, 1858). 



Mercer upper coal (= Tionesta coal of Lawrence County). 



Mercer shales. 



Mercer lower iron ore. 



Mercer lower. limestone. 



Mercer lower coal. 



Mercer lower ore shales. 



Connoquenessiug upper sandstone. 



Quakertown over-shales and ore. 



Quakertown coal bed. 



Quakertown under-shales and* ore. 1 



Connoquenessing lower sandstone. 



Sharon coal riders. 



Sharon upper shales and iron ore. 



Sharon plant shales. 



Sharon coal. 



Sharon Conglomerate. 3 



In Report Q 4 , 1881, the Sharon Conglomerate is said to be, 



For the western and northern counties, the accepted representative of the whole 

 or of the lower part of the " Ohio Conglomerate." In Warren and Venango Coun- 

 ties it is known under the name of " Garland Conglomerate." In McKean, Forest 

 Elk, Cameron, Clinton, and Potter Counties it is known as the " Olean Conglomer- 

 ate." In Clarion, Butler, Mercer, Lawrence, and Beaver reports it is called the 

 "Sharon Conglomerate." In the nomenclature of the oil drillers it is the "Second 

 mountain sand." 3 



The formations next below the Sharon Conglomerate are called by 

 Mr. White the " Subconglomerate formations." 4 



The name is applied to a series of deposits underlying the Sharon Con- 

 glomerate in Crawford and Erie Counties, and resting on the Yenango 

 oil sand group. 



The Subconglomerate is subdivided into the following, viz : 



Feet. 



Shenango group 75 



Mead ville group - 205 



Oil Lake group 162 



The Shenango group consists of the following members : 



Shenango shale. 

 Shenango sandstone. 6 



1 " The Mountain limestone (TJmbral, Mauch Chunk No. XI) or Maxville limestone, of southern 

 Ohio, should be found here." p. 49. 



'Called " Ohio Conglomerate " in QQ. 



"Report Q 4 , pp. 62, 63. # - 



4 These are well defined in chapters vn to XI, Report Q 4 1881. 



6 This is the Ferriferous sandstone, Report QQ, p. 95, sub-Garland conglomerate of the oil region re- 

 ports ; sub-Olean conglomerate of McKean, etc., reports ; upper Pocono sandstone (Vespertine) No. X ; 

 and it is the flat-pebble conglomerate first recognized as such by Mr. Carll (see p. 81) 



