Maryland Geological Survey 367 



about 3820 feot for the rocks which in Mar3'hind are referred to the 

 Jennings formation/ The Jennings formation of Polish ]\Ionntain may 

 be followed northeasterly across the eastern part of Bedford County 

 to Professor Stevenson's section " on the Huntingdon and Broad Top 

 Railroad, beginning in Saxton " which gave a thickness of " almost 

 3400 feet"' to which is to be added the 200 ± feet of Genesee shale' 

 making a total thickness of almost 3600 feet. 



From the specimens collected in the Jennings rocks on the western 

 slope of Polish Mountain Dr. J. M. Clarke has identified the following 

 species: Amhocoelia umbonata (Conrad), Atrypa hystrix Hall, Atrypa 

 reticularis (Linne), Camarotoecliia contracta Hall, Camarotoechia eximia 

 Hall, Clionctcs lepidiformis Clarke, Crania sp., Cryptonella cf. eudora 

 Hall, Dalmanella sp., Douvillina cayuta Hall, Liorhynchiis mesacoslale 

 Hall, Orhiciiloidea cf. media Hall, Productella lachrymosa (Conrad), 

 Productclla lachrymosa (Conrad) var., Productella speciosa Hall, Spvrifer 

 disjunctus Sowei'by, Spirifer marcyi Hall, var. supersies Clarke, Spirifer 

 mesacostalis Hall, Spirifer mesastrialis Hall, Tropidolepius carinatus 

 (Conrad), Nucalites sp., Schuchertella chemungensis (Conrad), Murchi- 

 sonia ecclesia Clarke, TentacuUtes discissus Clarke. 



Exposure on Williams Road on Polish Mountain. — This section begins 

 at the intersection of the Williams Eoad and Town Creek and then follows 

 the road to the top of Polish Mountain, crossing the same zones of the 

 Jennings formation as the section along the National Road and nearly 

 parallel with it but about 2 miles farther south. The road winds back 

 and forth to such an extent that no effort was made to measure the 

 thickness of the rock but there are various well-exposed zones of the 

 Jennings formation which extend from the bank of Town Creek to the 

 summit of the mountain. 



No. 2. In the cliff on the eastern bank of Town Creek just below 

 the highway bridge are smooth, argillaceous mainly light olive to bluish, 

 sparingly fossiliferous shales changing to thin sandstones. A few speci- 



^ T^ p. 75. 

 'Ibid., p. 78. 

 ' Ibid., p. 82. 



