This algal stromatolite mound and associated facies are located along the southeast margin of the Michigan basin, on the Niagaran reef barrier that isolated the basin during the Cayugan (Salina sedimentation) Epoch.

A petrographic study of 143 samples has shown eight major related microfacies which constitute the mound and associated facies: hemispherical stromatolite-constructed dolomite, both well- and poorly laminated; stromatolitic dolobreccia; flat stromatolite-constructed dolomite; grain-supported pelletoidal dolarenite; evaporitic dolosiltite; intraformational micro-dolobreccia; and grain-supported worm-tube dolarenite.

These microfacies form five major depositional units. At the bottom of the stratigraphic section is the hemispherical stromatolite-constructed dolomite unit which forms the mound structure. The mound is overlain by the stromatolitic dolobreccia unit, which consists mainly of brecciated material similar to that forming the mound. This is overlain in turn by the flat stromatolite-constructed dolomite unit, the pelletoidal dolarenite unit, and the evaporitic dolosiltite unit, which is the typical Greenfield Dolomite. The environments represented by these units range from high intertidal or supratidal to shallow subtidal. The entire sequence is related to generally quiet, restricted, and penesaline conditions.

Comparison with several Recent carbonate environment analogs, and use of Walther's Rule, suggest that a general transgressive phase of the five laterally juxtaposed environments would build the stratigraphic section described.