Saint Martin crater
It is 40 km (25 mi) in diameter and its age is estimated at 227 ± 1 million years (Carnian stage of the Triassic). The crater is well preserved but poorly exposed at the surface as the whole region is covered by glacial drift.
Hypothetical multiple impact event
It has 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 crater may have been part of a hypothetical multiple impact event which also formed the Manicouagan crater in northern Quebec, Rochechouart crater in France, Obolon' crater in Ukraine, and Red Wing crater in North Dakota. All of the craters had previously been known and studied, but their paleoalignment had never before been demonstrated. Rowley has said that the chance that these craters could be aligned like this due to chance are nearly zero.
- "Saint Martin". Earth Impact Database. University of New Brunswick. Retrieved 2011-04-14.
- Spray, J.G., Kelley, S.P. and Rowley, D.B. (1998). "Evidence for a late Triassic multiple impact event on Earth". Nature, v. 392, pp. 171-173. Abstract
- Steele, Diana (19 March 1998). "Crater chain points to impact of fragmented comet". University of Chicago Chronicle.
- Earth Impact Database
- Aerial exploration of the St. Martin structure.
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