Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Of or relating to the boundary between the Cretaceous and Tertiary periods, characterized by a mass extinction in which all nonavian dinosaur species perished and by a layer of rock enriched with iridium thought to have originated in one or more asteroid impacts.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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The theory carried some weight until now, because no fossils had been found within three metres of the K-T boundary, the geological line in sedimentary rock that signifies the impact of the asteroid.
'Last dinosaur' fossil adds weight to theory that asteroid wiped out creatures 2011
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Sure, it's a good hedge in the event of an K-T class impact event, but that's a once in a 10-100 million year proposition.
"Moon = Stupid": Its The Same Tired Rhetoric From Bob Zubrin - NASA Watch 2009
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Iridium, since it is more prevalent in celestial bodies and spread out through the K-T boundary throughout the world – it was a leading clue in the hypothesis that dinosaurs were wiped out by a big asteriod.
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These were sent to Antoine Bercovici at the China University of Geosciences, who analysed pollen grains in the rocks to identify the K-T boundary.
'Last dinosaur' fossil adds weight to theory that asteroid wiped out creatures 2011
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The K-T extinction event took place at the end of the Cretaceous period, not the Jurassic.
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The Cretaceous-Tertiary (K-T) extinction (ca. 65 MYBP).
Who Do You Say I Am 2010
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From LiveScience: "Recovery after most mass extinctions, including the K-T that killed the dinosaurs, seems to have taken 1 million to 4 million years," Benton said.
PHOTOS: Huge Discovery Of 20,000 Fossils Sheds Light On Life After Mass Extinction The Huffington Post 2010
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The problem is that the K-T boundary which I assume is the same as your “k-p line” is not all that far below the base of the lowest flow unit.
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The problem is that the K-T boundary which I assume is the same as your “k-p line” is not all that far below the base of the lowest flow unit.
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Unfortunately, most people do just that, and even if they do know the age e.g K-T boundary 65 MY ago, rarely let it sink in the scale of that time.
Parents who use science have children who use science. - The Panda's Thumb 2009
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