Maryland Geological Survey 369 



side of the road. Below is a considerable thickness of olive argillaceous 

 shale between this sandstone and the lower argillaceous red shales. 

 Specimens of Spirifer mesacostalis Hall occur in the more shaly sand- 

 stone. A few loose pieces of conglomerate were noticed on the surface. 



No. 7. Olive argillaceous shale occurs at the fork of the road, where 

 one turns to the south, and forms the greater part of the rock along the 

 road for some distance below the fork. One piece was found which con- 

 tained specimens of Ambocoelia umhonatn (Conrad). The blocks of 

 conglomerate are more common along the side of the road from this part 

 of the section to the summit of the mountain although most of the 

 pieces are small. 



No. 8. Thin layers of mealy sandstone containing abundant speci- 

 mens of Spirifer mesacostalis Hall which occurs only a short distance 

 above the fork in the road. The layer is in the midst of olive to bulf 

 argillaceous shales and is about 3 inches thick. The Spirifers com- 

 pose a considerable part of this layer and there are also specimens of 

 quite a large species of Holopea. The specimens of Holopea manjlandica 

 Clarke, Holopea rowei Clarke, and Macrochilina pulchella Clarke which 

 were described by Dr. J. M. Clarke and the locality given as " road over 

 Polish Mountain east of Eush " were from this section and perhaps this 

 zone. 



No. 9. Two bands of red shale cross the road above which are fine, 

 olive, argillaceous shales in which are thin layers containing specimens of 

 Spirifer mesacostalis Hall, Ambocoelia umbonata (Conrad), Productella 

 and pelecypods. Large blocks of massive coarse grained sandstone, 

 grayish in color but weathering to brownish-gray occur along the road and 

 on the mountain slope. It is probable that this sandstone occurs in 

 place at about this horizon although a ledge was not seen. 



No. 10. Olive shales occur above the loose sandstone, and one block 

 from this horizon contains large numbers of Spirifer mesacostalis Hall. 

 There are also thin, gray sandstones, 6 inches or more in thickness inter- 

 stratified with the shales. This zone is but a short distance below the 

 summit of the mountain. Loose on the top of the mountain near the four 

 corners are numerous small blocks of quartz pebble conglomerate which 

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