Peosser — Hamilton and Ckemfng Series. 



181 



consist of shales and thin sandstones and contain plenty of Hamilton 

 fossils. Typical Hamilton rocks with the characteristic fauna of the for- 

 math >n. 



1. Tropidoleptvx ea/rinatus (Con.), Hall. (c) 



2. Spirifer mucronai/as (Con.), Bill. (r) 



3. Spirifer TMUus, Hall. (c) 



4. Gryptonella {3umelM) LiTieMmni, Hall. (a) 



5. Stropheodonta p&rplcma (Con.), Hall. (rr) 



6. Pahwmilo fee an (la. Hall. (rr) 



7. Palceoneilo consbricia (Con.), Hall. (rr) 



8. Schizodus oppresses (Con.), Hall. (rr) 



9. Leila dwersa, Hall. (rr) 



10. Grammy sia ewieata, Hall. (rr) 



11. Granvmysia arcwata (Con.), Hall. (rr) 



XX IP. In this same brook at the foot of the glen and only fifteen feet 

 above the hotel, are argillaceous, blue, soft Hamilton shales, containing an 

 abundant Hamilton fauna. The dip is heavy to the southwest, judging from 

 the exposure in the brook. The following species were collected in a short 

 time : 



1. Tropidoleptus carinatus (Con.), Hall. (a) 



2. Spirifer muci'onatus (Con.), Bill. (c) 



3. Spirifer Tallin*, Hall. (rr) 



4. Grammysia alveata (Con.), Hall (?). (rr) 



5. Nuculites t/riquet&r, Con. (c) 



6. Lnaulicardia ai fragile, Hall (?). (rr) 



Rather heavy concentric undulations like Parctcyclas; too 

 imperfectly preserved for positive identification. 



7. Chonetes lepida, Hall (?). (rr) 



Specimens do not show the stronger striae near the center, 

 although one is apparently the ventral valve. 



8. Plea rotonutria, capill(tri<(, Con. (?). (rr) 



9. Phohdella radiata (Con.), Hall. (rr) 



10. Phacops rana (Green), Hall. (rr) 



11. Aviculopecten, sp. (rr) 



A section partly along this brook from Garrattsville northwest to Turtle 

 lake is as follows : 



