

Williams] WHITE, LESLEY. 101 



The first report written by Mr. White was published in 1878. 1 He 

 recognized the following formations in the district reported on, viz, 

 Beaver, Alleghany, and part of Butler Counties. 



Upper Productive Coal series, Pittsburg coal bed (ouly). 



Lower Barren Measure series, including the measures from the base of tlio Pitts- 

 burg coal to and inclusive of the Mahoning (Lower Mahoning) Sandstone, an 

 average of 600 feet. 2 



Lower Productive Coal series. From the base of the Barren Measures to the "Pied- 

 mont Sandstone " of Prof. Lesley, which the author regards the upper member 

 of the Pottsville Conglomerate No. XII. 1 * This is subdivided into Freeport group, 

 Kittanning group, and Clarion group, 325 feet. 



Beaver River series (J. P. Lesley). This was called by the author in MSS " Conglom- 

 erate series," thus identifying it with the series so called by Fontaine in West 

 Virginia. 4 



In the typical section of the series along the Beaver River and the 

 Conoquenessing Creek the series is as follows : 



Feet, 



1. Piedmont [?], Upper Homewood Sandstone 75-155 



2. Shales, inclosing sometimes a coal bed, iron ore, ? Mercer? limestone, and 



coal 20-80 



3. [Pottsville Conglomerate "] Conoquenessing sandstone; Massillon sand- 



stone of Ohio: 



(a) Upper members 40- 50 



(6) Middle members 35- 40 



(c) Lower members 20- 25 



4. Sharon shales ; sometimes thin layers of coal 7 



The name "Conoquenessing sandstone" was introduced for the first 

 time in this report. It is regarded by the author as equivalent to the 

 "Lower Pottsville Conglomerate." 



Mr. Lesley, in a note in the chapter on the Beaver River group, 5 re- 

 marks that he foresees — 



The probability that the whole group of Pottsville (serai) Conglomerate rocks, con- 

 taining as it does large and valuable beds of coal, will some day be considered as 

 included in the series of the Lower Productive Coal Measures, as it certainly is in 

 the Alleghany River series, and finally as the Conglomerate No. XII (whether called 

 Serai Conglomerate, Pottsville Conglomerate, Piedmont sandstone and Pottsville 

 Conglomerate, Upper and Lower Homewood sandstone, Homewood sandstone and 

 Conoquenessing sandstone, Massillon sandstone, for by all these names has one or 

 both of its principal members been designated) may be considered the base or bottom 

 member of the Lower Productive Coal Measures as justly as the Mahoning sandstone 

 is considered the bottom member of the Lower Barren Measures, the Counellsville 

 sandstone the bottom member of the Upper Productive Coal Series, and the Waynes- 

 burgh sandstone the bottom member of the Upper Barren Measures. 



In the Ohio correlations the classification of the Coal Measures was 

 substantially that originally proposed by the Kogers brothers and elab- 

 orated by the second survey of Pennsylvania. So far as the correla- 



'Geol. Survey of Pennsylvania, Rept. of Progress Q.: Report on Beaver, NW. Allegheny, and S. 

 Butler Counties, by I. C. White, pp. 337. 1878. 

 a Ibid., p. 23, etseq. 

 ■Ibid , p. 39, et seq. 



4 The conglomerate series of West Virginia, Am. Jour. Sci., vol. 11, 1876, pp. 276-284, 374-384. 

 •Ibid., pp. 65-66. 



