GEOLOGY OF THE FOURTH DISTRICT. 
ORGANIC REMAINS OF THE ORISKANY SANDSTONE. 
No. 29. — No. 59, page 148. 
Fig. 1 . Delthyris arenosa, Conrad (Geol. Annual Report, 1839, p. 65). 
Fig. 2. Atrypa elongata, Conrad (Annual Report, 1839, p. 65). 
Fig. 3. Atrypa peculiaris, Conrad (Annual Report of 1841). 
No. 30. — No. 60, page 149. 
Fig. 4. Atrypa unguiformis, Conrad. ( Hipparionyx proximus, Vanuxem, Geol. Report, p. 
124, fig. 4.) 
Fig. 5. Cast of Delthyris arenosa. 
The fossils of this rock are scarcely found in the Fourth District, except in loose scattered 
masses which are common in Seneca county. The rock is abundantly fossili- 
ferous on the eastern shore of Cayuga lake. 
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