Non-bird dinosaur fossils are only found below the K-T boundary and became extinct immediately before or during the event.

Across the K-T boundary, surface productivity decreased slightly.

Dinosaur fossils are only found below the K-T boundary.

He had an obsession with the K-T boundary itself.

There aren't many places in the world where there's an interrupted sequence of rocks at the K-T boundary.

"Why was he looking for the K-T boundary specifically?"

In general terms, the K-T boundary is about the most interesting layer of rock ever found.

Something to do with the K-T boundary itself.

The K-T boundary is the point only a little.

The local K-T boundary is contained within a sandy channel deposit made up of stacked bars.