Maryland Geological Survey 395 



very broad specimens of Spirifcr db^junctus Sowerby, Atrypa hystrix 

 Hall, ProductcUa and the type specimen of Palaeaster darhi Clarke. 



From these three zones on the road northeast of Oakland Dr. J. M. 

 Clarke has described the following fauna: Palaeaster darhi Clarke, Am- 

 bocoelia unihonata (Conrad), Atrypa hystrix Hall, Atrypa reticularis 

 (Lirme), Chondes sdtuluis Hall, Gyrtina hamiltonensis Hall, Douvillina 

 cayuta Hall, Douvillina cayuta var. gradliora Clarke, Leptostrophia pcr- 

 plana var. nervosa Hall, Sdiudiertella diemungensis (Conrad), Sdiizo- 

 phoria striatula, var. marylandica Clarke, Spirifer disjundus Sowerby, 

 Leptodesma longispinuiib Hall, Pterinea nodocosta Clarke. 



No. J). Exposures on the eastern slope of the hill to the west of the 

 run where the dip is northwest and the rocks consist principally of olive 

 shales, thin bedded greenish sandstones, a cornstone and some red shales. 

 Small blocks of quartz pebble conglomerate occur loose in the field and the 

 thin stratum was found in place by the side of the road. This conglom- 

 erate is similar to the thin one found to the northeast on the road toward 

 Hoop Pole Ridge. Not much higher are red shales and sandstones near 

 the farmhouse. The only fossils seen were segments of crinoid stems. 



No. 5. On the western slope of this hill toward the second run, and 

 east of the road fork near Oakland are greenish shales varying to thin 

 bedded sandstones near the top of the ridge. Lower are mainly red 

 shales and sandstones which extend to the bottom of the hill. The 

 sandstones are thin bedded and in n stratum of greenish sandstone near 

 the base of the section of nearly continuous red rocks a fragment of a 

 fish scale was found. These rocks, apparently, belong in the Catskill 

 formation although on the opposite side of the run a few fossils were 

 found. It is not perfectly clear, however, that this is a continuous section 

 and the fossiliferous layer, perhaps, is not above the zone of red rock. 



No. 6. On the eastern slope of the hill after crossing the small run 

 west of the old mill are, mainly, greenish, coarse grained, micaceous 

 sandstones in the lower part of which a few fossils were found as, for 

 example, Camarotoediia and pelecypods. Higher, sandstones alternate 

 with greenish shales while still higher are reddish rocks. On top of 



