It had previously been suggested by
Geophysicist David Rowley of the
University of Chicago, working with John Spray of the
University of New Brunswick and Simon Kelley of the
Open University, that the Saint Martin structure may have been part of a hypothetical multiple impact event which also formed the
Manicouagan impact structure in northern
Quebec,
Rochechouart impact structure in France,
Obolon' crater in
Ukraine, and
Red Wing crater in
North Dakota. All of the impact structures had previously been known and studied, but their paleoalignment had never before been demonstrated. Rowley has said that the chance that these structures could be aligned like this due to chance are nearly zero. However, more recent work has found that the craters formed many millions of years apart, with the Saint Martin crater dating to 227.8 ± 1.1 Ma, while the Rochechouart structure formed 206.92 ± 0.20/0.32 Ma. == References ==