Because the rocks of the Manitou Dolomites are mostly indeterminate carbonates, the exact depositional environment is unknown.
However it was likely shallow water, either lagoon or near-shore, and the many jumbled fossils of trilobite spines and brachiopods suggest that the paleoenvironment may have been prone to storms.
The limestones and dolomites of the Manitou Formation, contain cast/mold-preserved Ordovician-aged marine fossils, including cystoid stems, brachiopods, and trilobites such as Manitouella (Leiostegium?)
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