0 F T HE BO C K S OF L A K E SUP E R I O R. 



265 



heavy dike, and, in all respects, is like that on the easterly side of Pigeon Bay, and 

 marked No. 647. The weathered surface, however, is greenish gray, of a lighter 

 colour than the fresh fracture. Both these rocks, probably, contain diallage. 



654. Greenstone — colour, dark gray, nearly black ; the hornblende crystalline, 

 the felspar white. 



655. Syenite — composed of fine crystalline grains of hornblende and red felspar ; 

 but little quartz ; contains iron pyrites. 



656. Metamorphosed clay slate, in contact with a dike — colour, dark gray ; con- 

 tains a few scales of mica ; the planes of stratification and cleavage nearly oblite- 

 rated ; stained with oxide of iron. 



657. Argillaceous slate — very thinly laminated ; colour, nearly black. 



658. Siliceous shale — in thin laminae; colour, dark reddish black; somewhat 

 metamorphosed. 



659. Very fine-grained basaltic-looking rock ; somewhat schistose ; probably a 

 metamorphosed rock. 



660. Greenstone — colour, dark greenish ; very fine-grained ; compact. 



661. Similar to No. 660, but with well-developed minute crystalline grains of 

 hornblende. 



662. Hornblende rock — coarsely crystalline ; dark-coloured, the quartz being of 

 a dirty greenish colour ; graduates into syenite ; the felspar predominating, and 

 sometimes in large crystals. 



663. Like No. 661, but rather more crystalline; fine-grained; contains some iron 

 pyrites. 



664. Greenstone — colour, gray; fine-grained; compact; even fracture ; contains 

 small grains of reddish felspar. 



665. 666. Very fine-grained basaltic-looking rock — colour, greenish gray. May 

 be called a greenstone. 



667. Syenite — flesh-coloured felspar predominating; porphyritic. A beautiful 

 rock in the mass. 



668. Syenite — contains but little quartz or hornblende, being made up princi- 

 pally of red felspar ; passes gradually into regular greenstone. 



669. Quartzite — fine granular; colour, gray. A metamorphosed sandstone. 



670. Metamorphosed siliceous shale — very fine-grained ; colour, dark purplish ; 

 very compact ; fracture conchoidal ; somewhat impregnated with oxide of iron. 



671. Quartzite — colour, reddish gray ; fine-grained ; in some places resembles 

 syenite. A metamorphosed sandstone. 



672. Quartzite — colour, gray; fine-grained; sub-crystalline. A metamorphosed 

 sandstone. 



673. Greenstone — crystalline; compact; irregular fracture ; colour, dark greenish. 



674. Slaty greenstone — alternating with siliceous schist; colour, gray; contains 

 grains of red felspar. 



675. Greenstone — highly and minutely crjstalline ; porphyritic; colour, from 

 light to dark gray. 



676. Quartzite — fine-grained; compact; colour, dark gray. A metamorphosed 

 sandstone. 



34 



