A mica schist series near Thunder Lake, District of Kenora, in northwestern Ontario, has been heretofore regarded as pre-Keewatin or Coutchiching. A field study of this series by the writer radically revises older mapping and proves the sediments to be younger than a Keewatin hornblende schist complex. The sediments, however, contain a minor greenstone flow series. A less metamorphosed greenstone series is also present, but faulting makes age relations of this series uncertain.

Basic intrusives are associated with greenstones and sediments. Batholithic granites and pegmatites cut all other rocks of this area.

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