From 190 to 135 million years ago (8)

I believe the answer is:

jurassic

(Other definitions for jurassic that I've seen before include "-- Park, 1993 film" , "Of the period when the largest dinosaurs roamed the earth" , "- Park, dinosaur film" , "Age of dinosaurs" , "Between Triassic and Cretaceous" .)

I've seen this clue in The Guardian.

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