Petrographic study has shown eight major microfacies which constitute an algal stromatolite mound and associated rocks in the Greenfield Dolomite near Maumee, Ohio. These microfacies form five major depositional units indicative of depositional environments ranging from high intertidal or supratidal to shallow subtidal, and related to generally quiet, restricted, and penesaline conditions. The mound, which forms the base of the stratigraphic section, is composed of stromatolite-constructed dolomite and is overlain by stromatolitic dolobreccia, flat stromatolite-constructed dolomite, pelletoidal dolarenite, and evaporitic dolosiltite. These facies are compared with Recent carbonate units which suggest that they formed under transgressive conditions.

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