228 



DESCRIPTIVE CATALOG U E 



113. A very fine-grained, compact rock, of a dark purplish gray colour. Resem- 

 bles some of the basaltic rocks, but is probably No. 110, in near contact with a trap 

 dike. 



114. Volcanic grit. 



115. Amygdaloidal greenstone — contains many fragments of prehnite and chal- 

 cedony. 



116. Breccia — made up of fragments of Nos. 107 and 110, and the associated 

 rocks ; amygdaloidal, like all the breccias of this region. The fragments are mostly 

 large, and have been much acted on by heat. 



117. Very cellular, the cells mostly empty; when filled, it is with siliceous mine- 

 rals. Very ferruginous ; has an exceedingly rough, jagged fracture. Resembles 

 the scoria from a furnace. It seems to be made up of small fragments of rocks, 

 nearly fused and cemented together. 



118. Metamorphosed siliceous shale — amygdaloidal ; the cells being filled with an 

 undetermined green-coloured magnesian mineral. This rock appears to belong to 

 the thick earthy beds of the red sandstone series which are to be seen near Cut 

 Face River, and at several places near the west end of Lake Superior. 



119. Greenstone — coarsely crystalline; the hornblende predominates. 



120. Volcanic breccia — fragments small, and embedded in a fine-grained paste, 

 somewhat trappous in character. Bears some little resemblance to syenite. 



121. Trap tufa — overlies No. 120, and is separated from it by about ten feet of 

 metamorphosed shale. Has a somewhat crystalline appearance. 



122. 123. Metamorphosed shaky sand-rock — resembles volcanic grit, in some 

 places, and is full of zeolites. Alternates with trap tufa. 



124, 125. Volcanic grit — very coarse granular ; made up principally of rounded 

 and angular grains of hornblende, with some felspar grains, and a large portion of 

 zeolitic minerals. In general appearance, it resembles some syenites. No quartz 

 grains were detected in it. 



126. Metamorphosed siliceous shale — contains numerous minute crystals of horn- 

 blende, and some zeolites. Very compact, in general ; contains some cells. Is like 

 the rock which underlies the sandstone exposure at " Bark Point." 



127. Bedded trap — fine-grained; some of the beds present a laminar appearance. 



128. A highly crystalline rock — bedded ; some of the beds reddish-coloured, 

 others gray. Made up principally of grains of felspar and quartz, some of the 

 latter the size of a pea. 



129. 130. Alternations of trap and metamorphosed siliceous shale. Colour, gray, 

 and dark brown. 



131. Basalt — fine-grained; compact. 



132. Greenstone — the hornblende predominating; amygdaloidal, the cells filled 

 with scolezite, and probably other zeolites. 



133. Dolerite — rather coarsely crystalline ; the felspar, which is of the Labrador 

 variety, abundant. 



134. Trap tufa(?) — highly crystalline ; beaxs some resemblance to No. 133. Con- 

 tains numerous crystals of titaniferous iron ; zeolites, calcareous spar ; some quartz. 

 Hornblende abundant. 



