undifferentiated rock units

Paleontology and geology

Through the Permian, all the continents were colliding to form the supercontinent Pangea. Manitoba was close to the center and remained above sea level, exposed to erosion. Any deposition that took place was in lakes, river valleys, or lowlands, but few of these deposits remain. Many maps, including this one, show an exposure in central Manitoba that resulted from the impact of a meteorite, thought to have happened in the Permian. However, recent analyses suggest the impact occurred in the Middle to Late Triassic. The meteorite hit Precambrian metamorphic rocks, Ordovician to Devonian sandstones, shales, and limestones, and Permian rocks may be found in these altered and broken rocks as scientists continue to study them.