Red River Formation, Geological formation in Manitoba, Canada
The Red River Formation is a layered geological structure in Manitoba composed of limestone and dolomite rock. These deposits lie beneath the surface and extend to significant depths in the Williston Basin region.
These rock layers formed during the Ordovician period about 450 million years ago when shallow seas covered much of North America. Ancient marine deposits were later positioned where they sit today through geological processes.
The formation draws its name from the Red River of the North, which flows through the surrounding geological landscape.
The rocks lie beneath the ground surface and are studied today through quarries and drilling operations. The best way to observe the formation is at excavation sites or through geological museum exhibits.
The rocks are known locally as Tyndall Stone and became a valued building material throughout the region over time. Many older buildings in Manitoba use this stone, which comes from layers within this formation.
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