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Keyword: cretaceoustertiary

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  • Yale Scientists Discover the Last Living Dinosaur

    07/16/2011 4:39:22 PM PDT · by nickcarraway · 130 replies
    CTV ^ | Sat Jul. 16 2011
    A fossil discovered in Montana has given new momentum to the hypothesis that dinosaurs were thriving right up until a devastating meteor hit Earth 65 million years ago, causing their extinction. Scientists from Yale University have found what is believed to be the youngest dinosaur fossil ever found, thought to be from just before the mass extinction took place. The discovery, described in a study published in the online edition of the journal Biology Letters, contradicts the theory that the dinosaurs slowly went extinct before the cosmic impact. The fossil -- a 45-centimetre horn believed to be from a triceratops...
  • Asteroid may have killed dinosaurs quicker than scientists thought

    02/10/2013 5:50:15 PM PST · by SunkenCiv · 28 replies
    Reuters via Ya-hoooo! ^ | Friday, February 8, 2013 | Irene Klotz
    "The previous data that we had ... actually said that they (the tektites and the ash) were different in age, that they differed by about 180,000 years and that the extinction happened before the impact, which would totally preclude there being a causal relationship," said Renne, who studies ties between mass extinctions and volcanism. He and colleagues were comparing a new technique to date geologic events when they realized there was a discrepancy in the timing -- the so-called 'K-T boundary' -- the geological span of time between the Cretaceous and Paleocene periods when the dinosaurs and most other life...
  • Are Asteroids History's Greatest Killers?

    11/20/2003 12:31:59 PM PST · by LibWhacker · 71 replies · 450+ views
    National Geographic News ^ | 11/20/03 | John Roach
    Catastrophic asteroid impacts are gaining a credible edge over violent volcanic eruptions as the greatest killers Earth has ever seen, according to two pieces of scientific detective work reported in tomorrow's issue of the journal Science. The first cataclysm in question occurred about 250 million years ago, when according to the fossil record more than 90 percent of Earth's marine species and 70 percent of life on land perished. The event is known as the Permian-Triassic (P-T for short) mass extinction, named because it falls on the boundary between the two geological eras. The second event, known as the Cretaceous-Tertiary...
  • Double meteorite strike 'caused dinosaur extinction'

    08/27/2010 12:05:19 PM PDT · by decimon · 25 replies
    BBC ^ | Howard Falcon-Lang
    The dinosaurs were wiped out 65 million years ago by at least two meteorite impacts, rather than a single strike, a new study suggests.Previously, scientists had identified a huge impact crater in the Gulf of Mexico as the event that spelled doom for the dinosaurs. Now evidence for a second impact in the Ukraine has been uncovered. This raises the possibility that the Earth may have been bombarded by a whole shower of meteorites. The new findings are published in the journal Geology by a team lead by Professor David Jolley of Aberdeen University. When first proposed in 1980, the...