. [Reports]. GENESIS OF ORES. 213 ores in this formation leads one to suspect that conditions favora-ble for the reduction of metallic salts were present, wherever thewater from the land surface was added to the ocean. It is proba-ble that most of the lead derived from the disintegrated igneousrocks which was not carried down and redeposited in openingsbeneath the surface, was deposited in the ocean close to the very limited areas of Huronian sediments limit very greatlyour knowledge of the conditions present in the Huronian sea, butthe impression prevails that the shales offered ext
. [Reports]. GENESIS OF ORES. 213 ores in this formation leads one to suspect that conditions favora-ble for the reduction of metallic salts were present, wherever thewater from the land surface was added to the ocean. It is proba-ble that most of the lead derived from the disintegrated igneousrocks which was not carried down and redeposited in openingsbeneath the surface, was deposited in the ocean close to the very limited areas of Huronian sediments limit very greatlyour knowledge of the conditions present in the Huronian sea, butthe impression prevails that the shales offered extremely favorableconditions for the reduction of metallic salts. In this regionthere are areas of igneous rocks through which particles of mica-ceous hematite are very uniformly disseminated. From such areas,it is very probable that the iron ores of the Huronian were de-rived. Providing we are correct in our supposition as to the trans-ference of the metallic minerals during the pre-Cambrian times,cne would na
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