Internet science gadfly, Mr. Thomas Lee Elifritz, suggested a couple of years ago that the subtle elevation feature in Ontario described in his monograph below might be a candidate for what might remains after a large impact into the Pleistocene ice sheet. Like Mr. Elifritz or not, it is an interesting feature and I thought worth posting. If someone has access to Canadian LiDAR imaging I would love to see it more clearly.
Here is a Google Maps link, check out the dramatic and unmistakable outwash channel “spurting” from the southeast terminus of the feature.
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