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The KT Boundary (also called the Cretaceous-Paleogene, or K-Pg boundary) is a boundary marking the Cretaceous-Tertiary extinction (KT extinction) event. It is usually seen as a thin band, caused by an asteroid impact that wiped out much of life at the time.

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The K-T boundary, also known as the Cretaceous–Paleogene boundary, is a geological boundary marking the end of the Cretaceous period and the beginning of the Paleogene period. It is marked by a mass extinction event that wiped out non-avian dinosaurs and many other species around 66 million years ago. The impact of an asteroid or comet is believed to have played a significant role in this mass extinction event.

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10mo ago
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The K-T boundary is the distinct line that can be drawn around the world in the sediment that marks the time of the impact of a meteorite that caused mass extinction on Earth. It is characterized by a high Iridium concentration.

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12y ago
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Q: What is the K-T boundary?
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