Saint Martin crater, Impact crater in Manitoba, Canada
Saint Martin crater is an impact structure buried beneath the surface in Manitoba, spanning roughly 40 kilometers across. The structure lies hidden under layers of Jurassic sediment and glacial material, making it invisible to those exploring the landscape above.
The crater formed roughly 228 million years ago during the Triassic period from a large meteorite strike. This cosmic collision left a permanent geological scar beneath the region that persists in the bedrock today.
Scientists worldwide study this structure as part of a chain of impact craters possibly created during the same cosmic event.
The crater lies buried deep beneath the ground surface and cannot be seen or reached directly from above. The site appeals mainly to those interested in geology or in understanding the scientific significance of impact structures.
The impact altered groundwater chemistry across the region, raising salt and fluoride levels in well water that persist to this day. This demonstrates how a cosmic event hundreds of millions of years ago continues to shape the geology beneath the landscape.
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