SOLVED. SciFi. KT boundary. Iridium traces are actually evidence of interplanetary war of intelligent dinosaurs. Published early 1990s? [s]

[Steven]

This book (Maybe first of a series?) presents a forward/backward chronology where the KT boundary and excess iridium is actually evidence of a civilization destroying war between intelligent dinosaurs.

Parallel events taking place in the contemporary human political/military chronology.

Published early '90s?

[Daisy]

Steven, what do you mean by the KT boundary?

[Steven]

The K-T boundary separates the age of reptiles and the age of mammals, which was first recognized over one hundred years ago by geologists who realized that there was a dramatic change in the types of fossils deposited on either side of this boundary.

https://www.lpi.usra.edu/science/krin...

[Genesistrine]

Guess: Toolmaker Koan?

[Steven]

That is it! Yes, thank you so much!!!