K/T boundary

noun

1. geology

   1. Cretaceous/Tertiary boundary: the time zone comprising the end of the Cretaceous and the beginning of the Tertiary periods

   2. ( as modifier )

      K/T boundary sediments

Word History and Origins

Origin of K/T boundary¹

C20 K and T , symbols for Cretaceous and Tertiary, respectively

Example Sentences

Centrosaurines went extinct millions of years before the chasmosaurines that were wiped out with the rest of the non-avian dinosaurs at the K/T boundary.

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But then came the stunning discovery by Luis and Walter Alvarez, father and son scientists, who while studying a clay layer marking the K/T boundary in Italy found striking amounts of iridium.

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That large range straddles the so-called K/T boundary, the geological flash point that marks the end of the age of dinosaurs.

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Fassett said that other data he has collected and published prove that the fossil is younger than the K/T boundary.

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In particular, he said that fossilized pollen from the Ojo Alamo sandstone formation near the fossil could only have come from an era after the K/T boundary.

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