The Sudbury Basin in the Canadian Shield has been proposed as a meteorite impact site subsequently deformed by endogenic tectonism. Detailed study of the structural geology strengthens this hypothesis and strongly suggests that the deformation of the basin was coeval with major folding and flattening (2.0 to 1.6 b.y. ago) of the rocks of the eastern Southern province and the northwesternmost Grenville province.

The structural geometry indicates that most of these rocks have a similar strain history. Finite-strain analysis of deformed concretions within the Sudbury Basin suggests that originally it was almost circular in outline.

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