The oldest fossils in eastern North America are Neoarchean stromatolites discovered near Joutel, in the northern part of the Abitibi Subprovince of the Superior Craton. They are found in allochthonous limestone blocks as much as 2 m across in 2730-2720 Ma volcanic breccia and turbiditic volcaniclastic rocks of the Joutel Volcanic Complex. The stromatolites, which include thyssagetacean and pseudocolumnar forms, represent an assemblage transported to greater depth from biohermal or biostromal complexes formed in shallow-water settings on a submerged volcanic edifice.

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