74 The Middle Devonian Deposits of Maryland 



the Eomney formation. On account of the fairly definite linnits of 

 the formation at Gilpin, the absence of folds, and the direction nearly at 

 right angles to the line of strike it is probable that this is as reliable an 

 estimate of the thickness of the Eomney formation as has been obtained 

 in Allegany County. 



This belt of the Romney formation may be followed northeasterly 

 across the eastern part of Bedford County, and in the northeastern part 

 of it. Professor Stevenson gave two measurements of the thickness of 

 the rocks representing this formation. On Yellow Creek to the north- 

 west of Hopewell he obtained 1756 feet, but the upper limit was uncertain 

 and the lower portion difficult to measure,' from which is to be deducted 

 200 ± feet of Genesee shale,^ which was included in his Hamilton' group, 

 leaving 1556 feet for the thickness of the rocks equivalent to the Romney. 

 Somewhat farther northeast, near Saxton, he obtained 1587 feet for the 

 total thickness of these shales,* which agrees very closely with our result 

 in Gilpin. 



About 3 miles southwest of the Gilpin section by the side of the road 

 turning northeast and crossing Warrior Mountain from Rush, are ex- 

 posures of black argillaceous shales in which a few specimens of goniatites 

 were found and there are also quite large concretions of blackish lime- 

 stone one of which is over 2 feet in diameter. These shales are in the 

 Onondaga member of the Romney formation, but the Hamilton part of 

 the formation to the eastward is mostly covered. 



On the east side of the gap in Warrior Mountain, however, to the 

 east of Rush, the following species were obtained: Chonetes mucronatus 

 Hall, Spirifer mucronatus (Conrad), Spirifer audaculus (Conrad), Spi- 

 rifer angustus Hall, Spirifer sculptilis var. raarylandensis Prosser, 

 Spirifer sp., Nucula corhuliformis Hall, Pterinea fiabellum (Conrad), 

 Nyassa arguta ( ?) Hall, Pleurotomaria (Bembexia) sulcomarginata 

 Conrad, (?) Cyclonemu hamiltoniae Hall (poorly preserved specimen), 

 TIorrMlonotus deVayi (Green). 



* T-, p. 226. 

 ^Ihid., p. 82. 

 = Ibid., p. 81. 

 */bid., p. 82. 



