Mahylaxd Ueological Survey 51 



top of the formation. Both of these saudstone zones are clearly shown in 

 the sections on the Williams Koad and at Tonoloway Station, opposite 

 Great Cacapon, and the npper one at Gilpin and above CorriganvilJe. A 

 conglomerate is found about 175 feet beloAV the top of the Hamilton in the 

 sections east of Hancock. In the vicinity of Millstone it becomes con- 

 spicuous and forms well defined ridges. 



Fauna. — The shales in many localities are very fossiliferous, especially 

 those between the two sandstone zones, and contain numerous specimens 

 of such characteristic species of the New York Hamilton as Spirifer 

 mucronatiis (Conrad), 8. granulosus (Conrad), Atlnjris spiriferoida 

 (Eaton), Tropidoleptus carinatus (Conrad), Chonetes coronatus (Con- 

 rad), Phacops rana (Green), and other species. On account of the 

 presence of numerous Hamilton species together with a lithologic simil- 

 arity and approximate stratigraphic position this division of the Eomney 

 formation is regarded as equivalent to the Hamilton stage of Xew York. 



Eomney-Jexnings Boundary. — The boundary between the Hamilton 

 member of the Eomney and the Jennings formation is disciissed on a 

 subsequent page to which the reader is referred. 



DISTRIBUTION OF THE ROMNEY' FORMATION 



The Eomney formation in ]VIaryland is confined to Allegany and 

 Washington coimties in the Eidge District of the Greater x\ppalachian 

 Valley, the larger area occurring in Allegany County. The western area 

 enters this county from Pennsylvania at Ellerslie and, skirting the foot 

 hills of the Allegany Front, crosses to the Potomac Eiver and then extends 

 southwest to the bend in the river at Iveyser. In the region between 

 Shriver Eidge and Green Eidge are several areas, mostly narrow, their 

 outline due to the repeated folding of that section. The first one is a 

 V-shaped area the western arm of which passes through the eastern part 

 of Cumberland, the point extending into Pennsylvania, and the eastern 

 arm lying mainly to the east of Evitts Creek and west of Nicholas Moun- 

 tain extends south, crossing the Potomac Eiver at North Branch where it 

 enters West Virginia. In the valley between Nicholas and Collier moun- 



