MIDDLE AND UPPER DEVONIAN OF ROMNEY REGION 25 



natus (Conrad), Spirifer audaculus (Conrad), Nuculites ohlongatus 

 Conrad, Phacops, Fleurotomaria itys (?) Hall, Orthoceras telamon 

 ( ?) Hall, and Macrochilus hamiltoniae Hall. 



In color and composition these shales are fairly similar to those 

 above the lower sandstone on the Williams Road, Maryland; but 

 on weathering they seem to have hardened to some extent. This 

 shale contains, here and there, numerous small hard concretions as 

 well as those of clay-iron stone, and it is also blotched with spots 

 and streaks of dark-red color from the weathering of the iron. It 

 is very probable that the specimens of Nuculites ohlongatus Conrad, 

 N. trigueter Conrad, Palaeoneilo constricta (Conrad), P. tenui- 

 striata Hall, P. virginiana Hall, Grammy sia alveata (Conrad), G. 

 arcuata (Conrad) listed by Hall from Patterson's Creek, Va.,^ and 

 perhaps other species, came from this portion of the Romney 

 formation. These outcrops have a lithologic similarity to beds 

 across the Potomac River in Maryland which have been correlated 

 with the Hamilton and are their southern continuation. Further- 

 more, these rocks contain fossils that are common in typical out- 

 crops of the New York Hamilton, and for these reasons they are 

 referred to the Hamilton member of the Romney formation. 



NOTE ON THE CORRELATION OF THE MARYLAND HELDERBERG 



FORMATION 



Dr. Swartz in his "Introductory" account of "The Helderberg 

 Formation" states that "Rowe divided the Helderberg into the 

 equivalents of the ManHus, Coeymans, New Scotland, and Becraft 

 formations of New York. O'Harra, who prepared a report upon the 

 geology of Allegany County about the same time, assigned the 

 same Hmits to it."'' Mr. Richard B. Rowe was one of the writer's 

 students when he was professor of geology in Union College, where 

 Mr. Rowe studied under his direction the Helderberg formations 

 in their typical region in the Helderberg Mountains of eastern 

 New York. Later Mr. Rowe went as a graduate student to Johns 

 Hopkins University and began the field study of the Paleozoic 

 formations of western Maryland during the summer of 1897. In 



' Palaeontology, Vol. V, Part I, Lamellibranchiata II, 1885. 



^ Maryland Geological Survey, Lower Devonian, text (1913), p. 97. 



