WILLIAMS.] PLATT. 95 



THE COLUMN OP PALEOZOIC FORMATIONS. 



Series. 



f Upper Barron Measures. 

 (M) Brownsville (Washington) coal bod. 



Monongahela 1 &> Wayueabiirg coal bed. 



b ) (K) Sewickley c( 



: 



Conemaugh 



Alleghany. 



coal bed. 

 (J) Redstone coal bed. 

 (I) Pittsburg coal bed. 

 Middle Barren Measures. 

 Mahoning sandstone. 

 (E) Upper Freeport coal bed. 



(D') Middle Freeport coal bed. * 



Freeport limestone. 



(D) Lower Freeport coal bed (Reynoldsville). 

 Freeport sandstone. 

 (C) Kittanning coal bed. 

 (B')Ferriferous coal bed. 

 Ferriferous limestone. 

 (B) Clarion coal bed. 

 ,(A) Brookville coal bed. 



Conglomerate No. XII ( Serai. ) 



ev n „„ ( Sharon coal beds ) XT ^ T , TT , 



Sbenango \ Red shale ^No.XI (Umbral.) 



r ,„ fol - 11 \ New River coal beds ) , T v .-, ,. v 



Catskl11 \ White sandstone J No - x (Vespertine.) 



Chemung Olive shales ^ 



Portage Olive sandstone | „.(Vergent.) 



u Qinl i fnn < Juniata coal beds > No. VIII 



MaillIlt0n { Black shales f (Cadent.) 



Upper Helderberg.. Corniferous limestone J (Postmeridial.) 



Oriskany White sandstone No. VII (Meridial.) 



Lower Helderberg.. Lewistown limestone ) ^ VT (Preineridial.) 



Waterlime Cement layers ^wo. 1 (Scalent.) 



Clinton Red shales and fossil ore No. V (Surgent.) 



Medina Redsandstone } XT T , r , T ,. 



Oneida White sandstone J NoJV (Levant.) 



Hud8onRiver Slates No.III >,,, .. ,. 



Trenton Limestone No. II £<Matmai.) 



Calciferous Dolomites No. II (Auroral.) 



Potsdam Sandstone No. I (Primal.) 



In the first column tbe names below Shenango are those adopted by 

 the New York geologists previous to 1843. The numbers in the third 

 column are tbose adopted by the geologists of the first survey of Penn- 

 sylvania in the annual reports previous to 1842. The names in the 

 fourth column are those of the final report of the first geological survey, 

 by H. D. aud W. B. Rogers, published in 1858. The letters A, B, O, D, 

 E, applied to the coal beds of the Alleghany series are those adopted 

 by Hodge and Lesley. 1 



In 1876 Franklin Piatt described the geological coin in u at Counells- 

 ville. 2 



The section is as follows, viz : 



(1) The Upper (Monongahela) Coal Measures, including about 280 feet of slates, 



sandstones, shales, and limestones, and the " Great limestone" with the 

 ''Pittsburg coal bed" at the base. 



(2) The Lower Barren Measures, including, besides shales and sandstones, the Pitts- 



burg limestone, about 26 feet below the coal ; Connellsville sandstones, 76 feet 

 below the coal; and the Mahoning sandstone, 421 feet below the coal. 



•FifthAnnual Report, 1841 ; Lesley's Manual of Coal. 1856 ; and H. D. Rogers' Annual Report, 1858. 

 "Second Geol. Surv. of Pennsylvania, Rept. of Progress L: Special Report on the coke manufac- 

 ture of the Youghiogheny River Valley in Fayette and Westmoreland Counties, 1875, pp. 13-39. 



