Maryland Geological Survey 399 



were found. The dip lias eliangcd at this locality and is steeply toward 

 the northwest showing that the rocks are on the western side of the 

 anticlinal axis. The lithological appearance of these rocks is similar to 

 that of the more unfossiliferous layers of the Chemung stage of the 

 Jennings formation. From exposures, however, about 2 miles south of 

 Oakland specimens of Douvillina arcuatn Hall, Strophonella cf. reversa 

 Hall, Productus {Marginifera) hallanus Walcott, and Leptodesma rogersi 

 Hall were collected. 



Blocks of the white quartz, flat pebble conglomerate occur at several 

 localities between Sunnyside and Oakland. 



The Catsktll Formation 



introductory 



In Barton's account of the Devonian formations of central Vir- 

 ginia he sa)'s that " The Hampshire formation has yielded only a few 

 plant remains which throw no light on the equivalency of the formation, 

 but no doubt it comprised the representatives of the Catskill in their en- 

 tirety or in greater part." ^ As stated by Darton fossils are rare in 

 this formation as is the case in the corresponding one in Pennsylvania and 

 New York ; but the lithologic appearance and stratigraphic position agree, 

 in general, with those of the Catskill formation which has been shown 

 to be a local one in New York scarcely represented in the southwestern 

 part of the state while in the southeastern or Catskill Mountain region 

 it has replaced all of the Chemung and the greater part of the Portage of 

 western New York. It has been further shown that to the east of the 

 Susquehanna Eiver, in New York, the red rocks at first are interstratified 

 with those which contain Chemung fossils, while farther east the red and 

 greenish shales and sandstones replace all the rocks with the lithologic 

 characters of the Chemung and its fauna disappears. Below the Chemung 

 and in the midst of what corresponds to the Portage stage of western 

 New York is another mass of red and greenish shales and sandstones, 

 called the Oneonta formation which extends west of the Chenango Valley. 



' Amer. GeoL, Vol. x, 1892, p. 18. 



