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The lower portion and base of the Blake River Group immediately south of the town of Rouyn-Noranda is composed essentially of an east trending moderate to steeply north dipping submarine volcanic sequence which includes a lowermost tholeiitic mafic segment approximately 3 000 m in thickness containing several well defined and regionally continuous variolitic marker horizons, a central intermediate ash flow tuff band up to 600 m in thickness and an overlying mafic lava sequence which interfingers with the Beauchastel Rhyolite flow complex to the west. This volcanic assemblage forms a wedge shaped block structurally bounded by the regional east trending Cadillac Break to the south and the ENE trending Horne Creek Fault to the north.

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