Subsurface 3-D geophysical modelling of Skeleton Lake structure: a suspected impact crater in Muskoka, Ontario

Skeleton Lake is a suspected impact structure in central Ontario (Muskoka) Canada. The 3.5 km diameter lake has a roughly circular shoreline and a central deep basin (~ 65 m). Previous geophysical surveys conducted in the 1970's identified broad gravity and magnetic lows over the lake basin. Autochthonous breccias were also identified within Late Proterozoic basement rocks on the northwest shore but petrographic analysis did not reveal shock …