Abstract

Enigmatic molar tooth structure in a dolomitic stromatolite from the approximately 1.4 Ga Belt Supergroup, Glacier National Park. The formation mechanism of these typically Mesoproterozoic structures has long been a mystery, but likely involves the unique geomicrobiological processes of the time. Photo by Carrine Blank. [Vol. 49, No. 6, pp.1040–1055]

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