92 A. WINCHELL — A LAST WORD WITH THE HURONIAN. 



the upper series or system in the neighborhood of Wahnapitse lake — east 

 and west. From this, inverting his arrangement, we make the following 

 abstract : 



6. Quartzite, white and very pale sea-green, close-grained; with beds of quartz con- 

 glomerate interposed, and layers of talco-quartzose slate. -5^ * * The peb- 

 bles of the conglomerate are chiefly small, white, opaque, rounded masses of 

 quartz, occasionally mixed with rounded masses of red and green jasper. 



5. Slates, green, silicious, chloritic, with tolerably strong bands of quartzite. 



4. Slate conglomerate, resembling the slate conglomerate No. 2. 



3. Limestone, the strata always appearing much disturbed. It is in general associ- 

 ated with greenstone. Prevailing color when found in mass, a pale whitish 

 gray, sometimes passing into dark blue. The band is frequently brecciated 

 and often displaj^s rough, jagged edges, which appear to belong to layers of 

 hornstone. Portions of the band are indurated calcareous shale. 



2. Slate conglomerate, the matrix always greenish in color, sometimes with a regular 

 slaty structure, at others resembling a fine-grained greenstone trap. It holds 

 pebbles of white and red syenite in great profusion, with occasional masses of 

 green, brown and red jasper, rounded in form. Toward the bottom green slates 

 with very regular laminse, cleaving with the bedding and usually cut by par- 

 allel joints, 



1. Slates, fine-grained, green, silicious, with thin bands of green quartzite interstrat- 

 ified. Also, fine-grained slates, sometimes of a green tinge and often bluish or 

 black, weathering very black. Occasionally some layers assume a reddish 

 color. Copper and iron pyrites frequently present. 



The total thickness is supposed to be about ten thousand feet. 



In the descriptions Mr. Murray speaks of the lower slates as standing 

 nearly vertical, and havibg a " rough, jagged and wrinkled surface, break- 

 ing into elongated splinters when struck with the hammer" (p. 173). This 

 is on Sturgeon river, not far east of Lake Wahnapit{3e and near the gneiss. 

 Nearer to Lake Wahnapitse a conglomerate occurs, which "appears for the 

 most part to be nearly horizontal " (p. 174). This was overlain in a high 

 hill by a greenish-colored quartzite, having a dip of ten to twelve degrees. 

 Further southwest, about Lake Metagamashing, " the rock is a very fine- 

 grained, finely laminated green slate, portions of which contain rounded 

 pebbles of syenite" (p. 174). The dip is 10° to 12°, and from this to hori- 

 zontal. " They are divided by two sets of parallel joints, cutting the strata 

 into rhomboidal-shaped blocks." The rock is " cleavable to an unusual ex- 

 tent." From this region, along Whitefish river to Lake Huron, the dips 

 are changeful and inconstant, the entire country being " in a state of great 

 disturbance " (p. 181). Mr. Murray becomes impressed with the conviction, 

 however, that there are two slate conglomerates with a limestone between 

 them (p. 186) ; and, though the upper, with the superincumbent white and 

 greenish quartzites, is sometimes seen with a high dip, and the lower occa- 

 sionally with a dip as low as 60° to 80°, the latter is generally vertical or 

 nearly so, while the former varies between horizontality and a dip of 45°. 



