GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE MEDINA SANDSTONE. 



ILLUSTRATION No. 1. — No. 5, page 46 of this Report. 

 Figs. 1 and 2. Fucoidcs Harlani. This is the most characteristic and widely diffused fossil 

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

 upper part of the mass. 



No. 2. — No. G, page 48 of Report. 



Fig. 1 and 2. Euomphahts pervetustus, Hall. Cyclostoma pcrvetusta, Conrad (Geologi- 

 cal Report for 1839, page 65) ; inadvertently written Phurotomaria pervetusta at 

 page 48. 



Fig. 3. Cypricardia alata, H. Unio primi genius, C. (Geological Report of 1839, page C6.) 



Fig. 4. Orbicula parmulata, H. Lockport. 



Fig. 5. Lingula cuneata, C. (Geological Report of 1839, p. 64.) Medina. 



Figs. 6 and 7. Two views of Bellerophon trilobatus, Planorbis trilobatus, C. (Geological 

 Report for 1839, page 65.) Medina. 



Figs. 8 and 9. Cypricardia orthonota, H. Unio orthonota, C. (Geological Report for 1839, 

 page 66.) Medina. 



No. 3 — No. 10, page 52. 

 Lingula cuneata, as the shells appear when attached to the surface of sandy layers, in the 

 grey sandstone of Niagara county. 



