Poplar Bay, in southeastern Manitoba, is a circular lake approximately 3 km in diameter, 21 m in depth, and is framed by radial and arcuate photolineaments. Geophysical study of Poplar Bay shows a unique magnetic signature, and results of a gravity survey indicate a profound deficiency of mass under the lake. The form of the gravity anomaly is circular, and it has a maximum value of −7 mGal.There is no evidence of an igneous origin for the feature and data indicate the plausibility of a meteorite impact origin for Poplar Bay.

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