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FIGURE 3. Microfossils of the Paleoproterozoic (≈2,100-million-year-old) Gunflint chert of southern Canada. (A and B) Eosphaera, in B shown in two views of the same specimen. (C and D) Eoastrion. (E–G) Huroniospora. (H–K) Gunflintia. (L and M) Animikiea. (N) Entosphaeroides. (O–R) Kakabekia.

chert” (Barghoorn and Tyler, 1965), followed a few weeks later by Cloud 's contribution, “Significance of the Gunflint (Precambrian) microflora” (Cloud, 1965). Landmark papers they were!

Unlike the 1954 Tyler-Barghoorn announcement of discovery of the Gunflint fossils, which had gone largely unnoticed, the Barghoorn-Tyler 1965 article—backed by Cloud's affirmation of its significance—gener-



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