K/T boundary

British  

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

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Etymology

Origin of K/T boundary

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.

From Forbes

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.

From Washington Post

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

From Washington Post

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

From Washington Post

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.

From Washington Post