GEOLOGY OF MOOSE RIVER GOLD DLSTRICT — WOODMAN. 75 



ticularly to the latter mineral. Where bunches of these sul- 

 phides lie -within the quartz, the gold sometimes occupies the 

 margins and strings into the interior, sometimes is in leaves in 

 the interior. In this case it always has connection with the 

 margin. It is never seen against the side of a crystal of either 

 sulphide. Both pyinte and arseuopyrite have drusy cavities 

 when massive, but these are unoccupied, and give no evidence of 

 having ever been filled. 



PART IV.— SUMMARY OF GEOLOGICAL HISTORY. 



The theoretical problems regarding structure of the rocks, 

 origin of the veins and the ores, metamorphism, and other 

 phenomena of the Meguma series as a whole, are being considered 

 in separate papers, and will not be touched upon here. Certain 

 events, such as the intrusion of the granites, have left no effect 

 in this district, and their study must of necessity be pursued 

 elsewhere. All that is intended in these paragraphs is an outline 

 statement, without elaboration or defence, of certain important 

 events in the history of the series, evidence for which can be 

 obtained in Moose River. 



The sediments were deposited in comparatively shallow water, 

 in which currents distributed the detritus irregularly, giving a 

 marked discontinuity of strata. In this way, here and there 

 over the sea bottom and at diflerent times, larger amounts of 

 pelite were formed ; either alternating with sands regularly, or 

 more rarely having little sand dropped with the mud. Moose 

 River represents the latter type of what elsewhere in this 

 series of papers is called a " horizon of more abundant slate." 

 Between these, geographically and stratigraphically, little but 

 sand of various textures was laid down. Thus such a dome as 

 Moose River has very definite limits, not only north and south 

 by the overlying whin, but east and west ; and its veins cannot 

 be expected to extend indefinitely in any direction, nor to 

 reappear on any other dome. The slate and vein-bearing 

 horizons are also definitely limited in depth as well as in extent. 



