Excerpt from Reports on a Portion of Algoma and Thunder Bay Districts, Ontario, And, on the Region Lying North of Lake Superior Between the Pic and Nipigon Rivers, Ontario

Dikes of diabase varying from one inch to fifty feet in width, are common both in the granites and schists, and in a few places larger masses of this rock were noted. Of the specimens brought in, Mr. G. A. Young says they are all of ordinary types of diabase, in no instances holding olivine. One specimen is porphyritic, and a second shows a fine grained porphyritic contact facies.

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