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The evidence is still in doubt, but there is a chance that the asteroid that impacted the Earth 65 million years ago was not alone in its deadly mission that is associated with the extinction of over 75 per cent of species at the time. “It probably is a crater, but we really don’t have age data” said marine geologist Dallas Abbott from Columbia University.
Other planetary scientists looking for data are not optimistic about the discovery of a crater in the gulf of Maine that corresponds to the Cretaceous-Triassic (K-T) boundary. Any secondary impact would leave a blanket layer of debris in addition to the layer found at the Chicxulub impact.
Explanations for the lack of debris in the ridge system of Maine and Massachusetts lies in the past glaciers that scoured away all top layer rock evidence. Any remaining layers of debris in the geological recorded are likely to be found toward the south of the impact, that would have dropped there after the glacier retreated.
If there was a double impact it is likely that an asteroid or comet broke up before hitting the Earth, leaving a line of craters. A feature seen on other planetary bodies in our Solar System.
More info: Discovery Channel
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