Sudbury Crater
The eroded remains of a giant, 1.85-billion-year-old impact
crater in Ontario, Canada. The Sudbury Crater, at almost 200 km across,
is roughly the size of the much younger Chicxulub
Basin. But whereas the latter is believed to have been caused by an
asteroid that killed the dinosaurs, along
with many other life forms at the K-T boundary, it appears that the Sudbury
Crater was formed by a comet. Scientists have
reached this conclusion by comparing the mass of the impact melt at the
two sites: 18,000 cubic km at Chicxulub and 31,000 cubic km at Sudbury.
Related categories
• CRATERS
• GEOLOGY
AND PLANETARY SCIENCE
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