White.] 4:44: [June 17, 



seldom more than 5' — 10' exposed at any one locality, and 

 these are in every case olive, and drab colored shales. The 

 topography also shows that no hard nor massive rocks occur in 

 this interval, since on entering it the mountain immediately 

 breaks down to the S. E., giving a broad valley along the 

 Potomac, bordered by gently sloping hillocks. The interval 

 includes all the rest of No. VIII, whatever there may be of 

 Portage, Hamilton and Corniferous, and its thickness cannot be 

 less than 6000' 



96. OrisTcany Sandstone (No. VII), rises above the North Potomac 



nearly opposite the depot at Keyser, and arching up over New 

 Creek ridge (mountain) forms the bold cliff at Queen's point, 

 opposite Keyser, 400' almost vertically above the river ; a very 

 coarse, brownish sandstone, filled with its characteristic fossils, 

 Spirifer arenosus, Bensaelaeria ovoides ^n^i Platyceras ventrico- 

 sum; it comes down to the river at theR.R. cut a short distance 

 east from Keyser, with a strong south-east dip, but immediately 

 returning it comes up again with a strong N. W. dip (65°), 

 and arching up passes in the air over the next anticline to come 

 down again along the (monoclinal) crest of Knobby mountain 

 ("Knobbley"). Thickness 75' 



97. Loioer HekUrhurg (No. VI) ; at top a gray silicious limestone, 



with several layers of flint 6" — 10" thick, interstratified for 

 about 150', then follow blue and gray layers of pure limestone 

 x'ic\Aj fossiliferous, Strophomenaradiata, S. rugosa, Pentamerus 

 pseudo-galeatus, Bhynchonella ventrieosa, Spirifer macropleurus, 

 Atrypa reticularis, Tentaculitus ornatus, Leperditia alta, besides 

 numerous species of Favosites, Zaphrentis, Stromatopora, and 

 Ghcetetes, being very abundant. Very fine Trilobites are also 

 reported from some of the quarries, which from their (reported) 

 size must be species of Asaphiis. This is the limestone which 

 was identified in H. Gr. Jones's section as the Loioer Mountain 

 Limestone of XI, and 440' thick. My measurements make it 

 much thicker, however ; it is finely exposed along Limestone 

 run one-half mile S. E. from Keyser ; it makes the N. W. 

 slope of Knobby mountain all the way between Keyser and 

 Cumberland, the upper silicious layers often forming the irreg- 

 ular crest of the same ; its uppermost 300' are also exposed 

 under the great arch of Oriskany Sandstone at Queen's point 

 opposite Keyser, where the North Potomac cuts through New 

 Creek mountain. The fossils given were all seen in the upper 

 portion of the formation. No attempt was made to subdivide 

 the series, which consists of limestone throughout, the measure- 

 ment of which south-eastward along Limestone run gave the 

 horizontal distance through it 18 chains, with a N. W. dip of 

 63°, which would give a thickness of 1050' 



