RE V IE IV S 899 



and also in other areas, are conglomerates containing numerous 

 fragments of iron formation rocks, and therefore believed to be of 

 Upper Huronian age. In addition to the conglomerates whose 

 distribution was described in a previous report, 1 conglomerates 

 are known in the following areas : 



The Dor6 2 river conglomerate, which contains many pebbles of sandstone 

 and chert, has been found to extend within a few miles of the Helen mine, 

 and to be about twenty-four miles in length from the mouth of Dog River on 

 the west where it begins. In sections of some of the pebbles siderite has 

 been found, proving that materials exactly like those at the mine were rolled 

 on the inter-Huronian beach before the conglomerate was formed. Similar 

 conglomerates have been found at other points in this Huronian area; for 

 instance, two or three miles north of Coetz Lake, not far from the Josephine 

 mine. 



Conglomerates have not yet been found nearer the Batchawana jasper and 

 chert beds than at the north end of Goulais Bay, fifteen miles to the south, where 

 Murray mapped jasper conglomerate many years ago. The extensive bands 

 of quartzitic conglomerate containing blood-red jasper pebbles in the original 

 Huronian region, extending from Lake George almost to Thessalon, about 

 thirty miles, and found in several different bands, some of them quite to the 

 north of those mapped by Murray, have never been accounted for, since no 

 jasper has been found nearer than Batchawana, more than fifty miles to the 

 northwest, and there the jaspers are much duller in color. The accompany- 

 ing black chert pebbles, which are equally common, might have been supplied 

 by the cherty iron ore band nine miles northeast of the Sault Ste. Marie, 

 mentioned in a previous part of this report, though this is about ten miles 

 from the nearest of the conglomerates. The region is, however, little known 

 beyond the few miles of settled country along the St. Mary's River and the 

 north shore of Lake Huron, and future exploration may solve the problem. 



Numerous conglomerates occur along the same stretch of Huronian to 

 Sudbury, but no jasper or chert pebbles are known in them, though they are 

 found in quartzites and graywackes somewhat farther east on Lake Mata- 

 gamashing, not far from the jasper iron ore belt north of Lake Wahnapitae. 

 Small amounts of jasper conglomerate have been noted northward from this, 

 and a graywacke conglomerate containing jasper and chert pebbles extends for 

 some miles parallel to the Shining Tree Lake iron range but a mile or two to 

 the west. 



East of Lake Wahnapitae conglomerates with jasper are known at vari- 

 ous points to Lake Temiscaming, and also on the Quebec shore of that lake 



l Bureati of Mines, 1900, pp. 180-86, and Bull. G. S. A., Vol. XI, 1900, pp. 

 107-14. See Summaries, Jour. Geol., Vol. IX, 1901, pp. 447-9. 



2 Pp. 203-4. 



