
Skeleton Lake Impact Crater
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InGodsHands
N 45° 13.894 W 079° 26.438
17T E 622405 N 5009857
This is the Skeleton Lake Impact Crater at Skeleton Lake, Ontario, Canada.
Waymark Code: WMECVM
Location: Ontario, Canada
Date Posted: 05/08/2012
Views: 12
Skeleton Lake is an approximately circular depression of four kilometres diameter in central Ontario. The structure appears to truncate the regional geological and physiographic trends. The country rocks are Precambrian gneisses and migmatites. There are no volcanic or sedimentary rocks in the region, yet outcrops of breccia are found on the lake shore, and erratic boulders of Ordovician limestone occur along the south shore, evidently scoured from the lake bottom by glaciation. Aeromagnetic data indicate low uniform magnetization intensity under the lake, in contrast to the variable regional pattern. A detailed gravity survey has revealed a circular 3.3 milligal negative gravity anomaly which has been modeled by bowl-shaped distributions of low density brecciated rocks similar to those found at other meteor impact sites. These observations all imply that the Skeleton Lake depression is the eroded remnant of an impact crater from Paleozoic time, which has been preserved until the tertiary by a covering of Ordovician sediments.
Source: SKELETON LAKE – A PALEOZOIC IMPACT CRATER IN CENTRAL CANADA; E.D. Waddington, M.R. Dence; 1979 Canadian Journal of Earth Sciences.
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