Pbossek — Hamilton and Chemitng Series, 



quite coarse-grained, with every lithologic appearance of the coarser Hamil- 

 ton, while the abundant Hamilton fauna refers them unquestionably to that 

 formation. The list is : 



1 



1 . 



opt///?/ j-Uii/ux, naii. 





Q 

 _ . 



Opii 1/61 III Hi ID/KIT IIS IUOU.I, JD111. 





3. 



Spirifer granulosus (Con.), Hall (0. 



(rr) 



4. 



Tropidoleptus carinatus (Con.), Hall. 



(c) 



5. 



Ohonetes coronata (Con.), Hall. 



(rr) 



6. 



Amboccdia umbonata (Con.), Hall. 



(rr) 



7. 



Stropheodonta demissa (Con.), Hall. 



(n) 



8. 



Miorodon (Cypricardelld) tenuistriatus, Hall (?). 



(rr) 



Probably young specimens of this species, though they resemble 

 somewhat figures 19 and 20, plate 73 of M. bellistr'iatus, Con. 

 9. Tellinopsis HH<b&in(ir<jinat(t (Con.), Hall. (rr) 



10. Mbdiomorpha mytiloides (Con.), Hall. (rr) 



11. Grlyptodesma erectum (Con.), Hall. (rr) 



12. Pterinea flabeUa (Con.), Hall. (rr) 



13. Liopteria DeKayi, Hall. (rr) 



14. (?) Psilophyton princeps, Dn. (rr) 



Fragment. 



Near the top of the hill, about 2<»7 feet above the base of C\ is 

 an irregular, concretionary stratum, similar to those which are not 

 unfrequently found in the upper Hamilton and higher formations of eastern 

 New York. 



XXI V C 2 . At the top of the steep escarpment, near the brow of the 

 hill, some 350 feet above the creek level, are thin sandstones and shales, 

 certain layers of which contain many specimens of Spirit'/ /■ mucronatus (Con.), 



Bill. The following species were collected : 



1. Spvrifer mucronatus (Con.), Bill. (a) 



2. Cyrtina Ihimiitoririixix, Hall. (rr) 



3. Orthoihetes Ohemungensis (Con.), Hall. (rr) 



4. AmboooMa umbonata (Con.), Hall. (rr) 



5. (?) Aviculopectm princeps (Con.), Hall. (rr) 



The rocks and fauna of this outcrop are similar to those of XXIV D 8 , on 

 the western side of Otego creek, about .'{(50 feet above its level. It seems 

 clear that the Hamilton formation extends to the top of the ledges on 

 Mt. Vision and forms nearly, if not quite all of the hill. 



