The columnar branching stromatolite Archaeozoon acadiense Matthew 1890 occurs in platy fault-slivers of a biohermal or biostromal limestone that accumulated on a shallow submerged platform, possibly during Neohelikian time. The columns show that the stromatolitic beds at Green Head face north, and can be used to provide a partial estimate of amount and type of local tectonic deformation. Archaeozoon Matthew has attributes similar to those for such Riphean groups as Tungussia, Baicalia and Jacutophyton, and it is likely that one or more of these are junior subjective synonyms of Archaeozoon, or represent at least morphologic variants.

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