Churchillian orogeny

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Churchillian orogeny A Proterozoic phase of mountain building that affected an area in what are now northern Saskatchewan and northern Manitoba, Canada. It was probably caused by the collision of a microcontinent (see MICROPLATE) within a subducting oceanic plate, moving northwards, with a fore-arc, and may have started about 1900 Ma ago and ended about 1850 Ma ago.