436 The Upper Devonian Deposits of Maryland 



of the Genesee in Huntingdon County is the same as the Lower Chemung 

 conglomerate, occurring 2600 to 2700 feet above the base of the Jennings 

 in Maryland, and that tlie Lackawaxen conglomerate occurring 3659 

 feet above the base of the section in Pennsylvania is the same as the 

 Upper Chemung conglomerate occurring 3400-3500 feet above the base 

 of the Jennings. In that event the Hauns Bridge beds probably represent 

 the upper sandstone and sliale beds of the Chemung of Maryland whicli 

 are 1200 to 1400 feet thick in the central part of the area, while his 

 non-marine Catskill beds would be the Catskill of this State. This com- 

 parison is only tentative in the absence of adequate faunal evidence. 



J. J. Stevenson discussed the Upper Devonian of the eastern United 

 States in his Vice-Presidential address delivered before tlie American 

 Association for the Advancement of Science in 1891.' In this paper he 

 states that there are two conglomerates in the Chemung traceable from 

 Tennessee to New York and correlates them throughout that entire area 

 by their lithological character and stratigraphic position. 



The following section which is situated immediately north of the Mary- 

 land-Pennsylvania state line, in Fulton County, Pennsylvania, is given 

 by Stevenson in his report on the geology of Bedford and Fulton 

 counties." 



Catskill Formation 

 Red non-marine sediments. 



Chemung Foemation 



Shale beds with marine fossils SOO 



Upper conglomerate, 2810 feet above base of Portage 10 



Shale and sandstone 950 



Lower conglomerate, 1850 feet above base of Portage 10 



Shale 450 



Total thickness of Chemung 2220 



Portage formation 1400 



Total 3620 



'Proc. A. A. A. S., 1891, vol. xl, p. 219, and Amer. Geo!., vol. ix, 1892, p. 6. 

 This paper is quoted in full by Lesley in the Final Rept., 2d Geol. Survey Pa., 

 1S92, vol. ii, pp. 1405-1433. 



= Rept. 2d Geol. Survey Pa., vol. T2, 1882, p. 75. 



