102 «= M. E. Wadsworth—Rocks of Newfoundland. 
Jasper. 
Where ‘ke lava flows or intrusive masses come in contact 
with the argillite the latter is often baked to a dark brick-red 
jaspery mass, irregularly fissured, traversed by minute quartz 
and calcite veins and breaking with a conchoidal fracture. 
One section (862) is composed of a reddish brown groundmass 
of ferrite globules mingled with secondary quartz «nd holding 
numerous globular and irregular patches of quartz. These 
segregations peta lat form the principal portion of the sec: 
tion. Veins filled with quartz and calcite with some epidote 
traverse the eae ome chlorite, iieaalite: ine 
pipe, although little fused globules appeared in the case of No. 
859, owing to the epidote in it. servations made by myself 
indicate that rocks beaiatity called jasper are formed by the 
induration of argillite by eruptive action, by chemical deposi e 
tion, and by eruption—the second form only being true jasper- . 
Tue ORE Deposits. 
At the time of my visit the at ee of the Betts Cove 
Mine were filled with water. The mining had been done in an 
irregular manner, taking the ore i bhieeae it could be found; 
thus the walls not having sufficient support had broken away 
on one side and fallen in. All the work then doing was in the | 
taking out of ground that had been “eft i in the upper workings. 
The mine is in mixed argillite, chlorite schist, and diabase. — 
The ore band runs east and west, and is cut by north and 
south dikes, of which there were said to be ten in the min 
The dikes seen were all diabase. Over one-half of the adja- 
cent country rock is eruptive, but all the ore of importance 18 _ 
ara in ve schistose portions formed from the altered acu 
and se. e ore is of secondary deposition, being 
aeepation in the broken fissured altered portions of the rock, 
and, judging from the ore seen and the workings, must have | 
occurred in immense irregular masses. The ore is chalcopyrite 
mixed with pyrite, quartz, ete. The foot wall is formed by _ 
diabase. A 
The upper portion of Little Bay Mine is worked in chlorite - 
schist impregnated with chaleopyrite. The whole is longitudi- 
ideo ag ne : ere Varieties of Quartz. Proc. Bost. ~~ Nat. — 
Hist., 1877, 
