224 



C. S. Prosser — Upper Hamilton and 



At North Norwich, five miles south of Sherburne the zone 

 of blue argillaceous shales, with no fossils, is well exposed 

 along Blue or Cold brook, about 76' above E. E. level or 

 approximately 1099' A. T.* At about 144/ above E. E. or 

 approximately 11 6Y 7 A. T., is the base of the zone containing 

 fossils. This zone is well exposed in the old Harris, now 

 known as the Wilkes, quarry which was mentioned by Van- 

 uxemf and is in the edge of Plymouth, about 305' above E. K. 

 level or approximately 1378' A. T. Exposures near the top 

 of the hill 427' above the E. E. or approximately 1456' A. T., 

 still contain the same fauna. 



In the Harris or Wilkes quarry the following species were 

 found : t 



1 . Spirifera mesacostali: Hall (c) 



2. Atrypa reticularis (Lrme) Dal. (cc) 



3. Leiorhynchus mesocostalis Hall (c) 



4. Chonetes scitula Hall (?) (a) 



This species is abundant ; but in the 

 condition of impressions renders identifi- 

 cation difficult. Some of the specimens 

 approach C. setigera Hall in form, though 

 they are not so convex near the umbo as 

 those found at Ithaca. 



5. Chonetes lepida Hall 



6. Cyrtina hamiltonensis Hall 



7. Strophodonta sp. , __ 



.(rr) 

 .(rr) 

 .(rr) 

 Two imperfect impressions which are 

 similar to S. perplana (Con.; Hail. 



8. Productella sp. _ (c) 



9. Microdon (Cypricarclella (bellistri- 



ata (Con.) Hall or M. tenuistri- 



ata Hall (rr) 



A single specimen which has the pro- 

 portions of M. bellistriata as well as 

 those of the elongated form of M. 

 tenuistriata Hall (see PI. 73, fig. 28). It 

 is impossible to determine whether the 

 specimen has the fine striae of M. te- 

 nuistriata or the coarse striae of M. 

 bellistriata. 



10. Paracyclas lirata (Con.) HalL_(rr) 



11. Cimitaria recurva (Con.) Hall..(r) 



12. Palceoneilo emarginata (Con.) Hall 



(rr) 



Of the seventeen species specifically identified in the above 

 list, counting those that are questioned, there are twelve that 

 occur in the " Ithaca group " at Ithaca. The general range of 

 the other five species is as follows : 



* The R. R. station at North Norwich is about 1023' A. T. 

 f See Geol. N. T., Pt. Ill, 1842, pp. 178, 293. 



X Pal. N. Y., vol. v, Pt. I, Lamell. II, p. 302; see pi. 44, fig. 7 for figure of 

 form similar to the North Norwich specimen. 



13. Goniophora carinata (Con.) Hall (?) 



--- (r) 



This species is reported from Copley's 

 quarry at Oneonta.j A comparison of 

 specimens from the two localities fails to 

 prove them precisely similar ; but the 

 North Norwich specimens are nearer 

 this species than any of the others fig- 

 ured in this work. 



14. Modiomorpha sp. (a broken speci- 

 men) (rr) 



15. (?) Glossites depressus Hall (rr) 



A single specimen which apparently 



belongs to this genus and species. 



16. Palceoneilo constricta (Con.) Hall 

 — (rr) 



17. Orthis sp (rr) 



18. Leptodesma cf. Roge rsi Hall (r) 



These specimens do not have as mu- 



cronate ears as most of those figured • 

 but some of them resemble closely the 

 one figured on pi. 21, fig. 9 (Pal. N. Y., 

 vol. v, Pt. I, Lamell. 1), which is stated 

 to be from the Hamilton shales at Nor- 

 wich, N. Y. 



19. Streptorhynchus chemungensis 

 (Con.) Hall ..' (r) 



20. Actinopteria Boydi (Con.) Hall (rr) 



21. Phacops rana (Green) Hall (rr) 



