16 



THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. 



Lower Kittanning bed (I. C. White), so it becomes evident that the deposition of the 

 Cannelton slates was at only a slightly later period than that of the shales in which 

 the Mazon Creek nodules occur, since the Mazon Creek shales form the roof of the 

 Morris, which "is probably somewhat lower than the Lower Kittanning of Pennsyl- 

 vania." From the Cannelton slates are known the remains of plants, insects, crus- 

 tacea, especially "Eurypterids found in shale immediately below the Darlington 

 (Upper Kittanning) Cannel Coal, near Cannelton, Darlington Township, Beaver 

 County, Pennsylvania, Horizon, Allegheny River Series" (Hall, 1884). In these 

 shales occur also fishes and the 3 species of amphibians referred to above. The 

 Amphibia known from this region are small, the largest of them not exceeding 6 

 inches in length. 



Contour interval 20O fret 



FIG. 4. Portion of "West Virgink-Ohio-Pennsylvania, Wellsville Quadrangle" of the 

 U.S. Geological Survey, to show topography and sitxiation of Linton coal mines. Some 

 fossil amphibians doubtless came from across the line in Columbiana County. 



(n) The Linton, Ohio, beds outcropped near Linton post-office, which was for- 

 merly located at the mouth of Yellow Creek, a few hundred yards from the present 

 station, Yellow Creek, Salem Township, Jefferson County, in the valley of Yellow 

 Creek, near the Ohio River, and thus near the Pennsylvania state line. 



In regard to the exact location of the town of Linton, which has long since been 

 abandoned, I quote from a letter from Dr. Louis Hussakof, who visited the locality: 



' ' The locality appears to have been known as Yellow Creek for many years past. That 

 is the name used in the Geological Map of Ohio published by Orton in 1888 and which was 

 based on the earlier maps of Newberry (1869 and 1879). When I visited the place in 1905, 

 and asked for Linton (which I had not been able to locate on any map then available to 

 me), hardly anyone knew of such a locality. Only one old man in Steubenville, Ohio, 

 recalled that Yellow Creek was identical with Linton. 



