184 



An analysis of the columns on the left hand side of this table shows 

 that forty-two species or varietal forms, or considerably more than one- 

 third of the whole, are common to two or more of Mr. Eichardson's 

 divisions. 



It has already been remarked that by far the largest number of species 

 are from the Productive Coal Measures, or Division A. These deposits, 

 which seem to be peculiarly favourable to the preservation of the shells 

 of mollusca, &c., occupy a much greater superficial area than all the rest 

 of the formation, and have been examined with special care in conse- 

 quence of their economic importance. In the Cowitchen area, how- 

 ever, they have so far only yielded a few good specimens of Sete- 

 roceras Cojiradi, an undetermined species of Inoceramus, and some fossil 

 plants. 



The Lower Shales (Division B) appear at the surface only on or near 

 the shores of Baynes* Sound on Yancouver and Denman Islands in the 

 Comox district, and on Gabriola Island in the Nanaimo area. 



The Lower Conglomerates (Division C) have been observed only at 

 one locality on the east side of Denman Island and on Norris Rock. 

 The extreme paucity of fossils in these conglomerates seems to be partly 

 due to the limited extent of the exposures of the latter, and partly, also, 

 to the fact that this part of the series is largely made up of fragments 

 of the underlying and mostly crystalline, non-fossiliferous rocks. 



All the fossils yet collected from the Middle Shales (Division D) are 

 from the west side of Hornby Island, though the supposed equivalents 



