170 THE CANADIAN NATURALIST. [Vol. 



Stenopora fibrosa, Goldfuss. 

 Columnaria alveolata, Billings. 

 Athyris headi, Billings. 

 Strophomena allernata, Conrad. 

 Strophomena dellotdea, Conrad. 

 Leptsena sericea, Sowerby. 

 Orthis testudi7iaria, Dalmau. 

 Orthis occide7italis, Hall. 

 Orthis lynx, Eichwald. 

 Obolella crassa, Hall. 

 Modiolopsis modiolaris, Conrad. 



Modiolopsis (several undermined species). 



Cyrtodonta harrietta, Billings. 



Orthonota 



Ctenodonta 



Lyrodesma poststriata, Emmous. 

 Amhonychia radiata, Hall. 

 Avicula demissa, Conrad. 

 Murchisonia gracilis, Hall. 

 Cyrtolites ornaius, Conrad. 

 Orthoceras lamellosum, Hall 

 Ormoceras crebiseptum, Hall. 

 Leperditia canadensis, Jones. 



APPENDIX B. 



Since writing the Report on the Palasozoic Geology of the 

 Region about the Western End of Lake Ontario, I have observed 

 that Dr. Hunt, in his Report on the Canadian Petroleum Regions 

 of Canada (1863-66). gives the log of a well sunk on the eleventh 

 lot of the seventh range of Barton, which is as follows : 



Limestones with a little shale 250 feet 



White sandstone 5 " 



Red shales with bluish bands 595 " 



Bluish and grayish shale 23 " 



873 '' 



The location of this well is about two and a half miles south- 

 ward of the brow of the " Mountain " at Hamilton. The upper 

 250 feet include both the Niagara and Clinton formations, 

 which measurement is almost precisely the same as the thick- 

 ness of these strata ascertained by measurement at Dundas. 

 Consequently, we may consider the summit beds in both places 

 as nearly identical, whilst the beds at Carpenter's Limekilns, 

 not much more than a mile distant from the Barton well, are 



