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. Fucoides 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. 6, page 48 of Report. 
Fig. 1 and 2. Euomphalus pervetustus, Hall. Cyclostoma pervetusta, Conrad (Geologi¬ 
cal Report for 1839, page 65); inadvertently written Pleurotomaria pervetusta at 
page 48. 
Fig. 3. Cypricardia alata, H. Unio primigenius, C. (Geological Report of 1839, page 66.) 
Fig. 4. Orbicula parmulata, II. 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. 
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