300 Review of the New York Geological Reports. 



The Fucoides Harlani is the typical and most widely distribu- 

 ted fossil of the Medina formation. Mr. Yanuxem found it in 

 equivalent strata both in Pennsylvania and Virginia. There seems 

 to be some discrepancy in the Report, as to the exact position it 

 holds in the Medina formation. We find in Hall's Report the suc- 

 ceeding paragraphs : " In the third division of the rock two species 

 of Fucoides abound in great perfection, the F. Harlani and the 

 F. auriformis.^' And elsewhere, speaking of the F. Harlani: 

 " This is the most characteristic and widely diffused fossil of this 

 rock. Its vertical range is very limited, holding a place near the 

 upper part of the mass."* And again : " In the upper division, the 

 only fossil known is the Dictuolites Beckii of Conrad. This is 

 one of the most interesting fossils found in the rock, often cover- 

 ing large surfaces with its strong ridged branches and beautiful 

 intercalated rootlets." Below are the shells figured in Hall's Re- 

 port, found in the grey sandstone, (second division.) 



Plate 6, p. 48, Hall's Report. 



Plate 6, figs. 1 and 2. Pleurotomaria pervetusta. 3. Cypri- 

 cardia alata. 4. Orbicula parmulata. 5. Lingula cuneata. 

 6 and 7. Bellerophon hilohatus. 8 and 9. Cypricardia orthonata. 



The position of the Lingula cuneata is curious. Their beaks 

 are all turned one way, nearly N. N. W. with a little ridge of 

 stony matter extending beyond. Both valves are seldom, if ever 

 found together, and the convex side of the shell is upwards, bear- 

 ing evidence, as Mr. H. infers, that they have been strewed by 

 a tide or current and lodged on some sandy bottom. 



The surface of the quarries of grey sandstone at Lockport 

 show, in connection with the above, numerous curved and often 

 parallel ridges, believed to be wave lines which have escaped 

 obliteration during the hardening of the sandy strata. 



* By " the upper part of the mass" in this place, Mr. Hall refers to the upper 

 part of division third, which moreover is near the upper part of the rock, as the 

 fourth division is scarcely above six or eight feet thick. — Eds. 



