Manitou Limestone

The Manitou Limestone is a geologic formation in Colorado. It preserves fossils dating back to the Ordovician period.
Depositional Environment.
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.
Paleontology.
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"?) and "Kainella".