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originally posted by: onequestion
a reply to: Marduk
Scientific American seems to disagree with Wiki.
Sediments from six sites across North America—Murray Springs, Ariz.; Bull Creek, Okla.; Gainey, Mich.; Topper, S.C.; Lake Hind, Manitoba; and Chobot, Alberta—yielded such teensy diamonds, which only occur in sediment exposed to extreme temperatures and pressures, such as those from an explosion or impact, according to new research published today in Science.
Oh I don't know which source is more credible... Scientific American, or wiki?
Comets Didn't Wipe out Sabertooths
Chronological evidence fails to support claim of an isochronous widespread layer of cosmic impact indicators dated to 12,800 years ago
Comet Theory Comes Crashing to Earth