230 



DESCRIPTIVE CATALOGUE 



160. Same as No. 159 — more compact, and finer-grained. 



161. Volcanic grit(?) — curiously wrinkled ; resembles a mass of cords laid side by 

 side, and cemented together. This rock ought, probably, to be placed among the 

 breccias. Colour, dark red and brown. Fractures so easily between the wrinkles, 

 that it is almost impossible to procure hand specimens of any size. In the mass, it 

 is very hard and compact. 



162. Volcanic grit — in near contact with a trap dike. Very rough fracture. 

 Contains a great deal of peroxide of iron and " green mineral" in grains. 



163. 164. Volcanic grit — very amygdaloidal ; full of calcareous and magnesian 

 minerals ; many of the cells filled with the undetermined " green mineral" (thalite ?) . 

 Colour, red and reddish gray; fracture, somewhat nodular. (See note to No. 151.) 



165. Same as No. 163 — less amygdaloidal. 



166. Volcanic grit — very fine-grained; colour, dark red; differs very little from 

 the ordinary red sandstones which have been subjected to metamorphic influences. 

 Contains prehnite in botryoidal masses. 



167. Volcanic grit — amygdaloidal. 



168. Dolerite — fine-grained; colour, dark gray, nearly black ; compact. 



169. Metamorphosed volcanic grit — has a very trappous appearance ; colour, 

 dark reddish gray ; compact. Has been much acted on by intrusive dikes. 



170. Trap tufa — very ferruginous; soft; easily broken down; decomposes into 

 an ochre. 



171. Brown hematite — in masses in No. 170. 



172. Metamorphosed volcanic grit — same as No. 169. Colour, dark purplish 

 gray. 



173. Metamorphosed siliceous shale — very compact; porphyritic; colour, reddish, 

 purplish; resembles the lower part of the "Great Palisade Rock," No. 251. It is 

 rendered porphyritic by decomposing crystals of felspar. 



174. Volcanic grit(?) — has a trappous appearance. Seems to have been subjected 

 to the metamorphic influence of several eruptions of trap, subsequent to its deposi- 

 tion. 



175. Dolerite — amygdaloidal; fine-grained; colour, dark reddish gray; many 

 small glistening crystalline points. 



176. Metamorphosed siliceous slate — somewhat thinly laminated. Same as No. 

 54, and possesses all its characteristics. 



177. 178. Alternations of No. 176, with metamorphosed argillaceous shale; the 

 latter very soft and cellular; the former very hard and compact, like No. 176. 



179. Dolerite (?) — basaltic-looking, but minutely crystalline; colour, gray, with a 

 reddish tinge. 



180. Metamorphosed shale — amygdaloidal ; purplish-coloured ; the cells filled 

 with zeolites. Resembles the shale of Cut Face River. 



181. Dolerite. 



182. Basaltic rock — very fine-grained. 



183. Volcanic grit — very amygdaloidal ; contains prehnite in cells. 



184. Volcanic grit — amygdaloidal; colour, brick-red. The cells contain zeolites 

 and calcareous spar. 



