Arth. 



38 



muddy slate partings. (T, p. 47).— In Huntingdon Co. large 

 branching forms cover exposed surfaces in Waterstreet gap (T3, 

 143), and in Rockhill gap of Black Log at Orbisonia, the top 



IV 5.AZ 



400' of Medina alternations of hard white sand rock layers and 

 red and green shales (T3, 145). Specimen 5246, came from 

 the White Medina at Greenwood furnace, Broad Mountain 

 (00, p. 37.) — In Bedford Co. it was the only fossil ever seen 

 by Stevenson in the White Medina (T2, 91); Piney ridge 



