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a moraine is unconsolidated material. What you are seeing in the photo is all basically bare bedrock including the semi-circle, because you are looking at part of the Canadian Shield - as the wiki says - The North American craton is the bedrock forming the heart of the North American continent and the Canadian Shield is the largest exposed part of the craton's bedrock.
When it comes to round land forms that are natural craters are not rare, but CONFIRMED craters are rare.Confirmation requires several different things be found at the site. If nothing known to be a result of an impact can be found then other explanations are used as in the semi-circle formation in the Hudson Bay to the East of this.Confirmation is NOT free. To actually send out a team to simply prove or disprove an object is an impact site can be prohibitively expensive especially when it's to a location as remote as the Great Slave Lake.Without greater justification it's not going to happen. So it's nature is left undetermined.Undetermined is NOT the same as NOT being something.