Looking for a story about a paleontologist uncovering fossilised dinosaur tracks who finds that it is chasing a jeep

Question

Looking for a short story from probably 70s or 80s.

I can't remember most details but I think it involves a paleontologist and another scientist chatting. The paleontologist is in a desert and uncovering a series of fossilised footprints of a dinosaur that appears to be chasing something.

The other scientist is deliberately vague about what is going on at a hush-hush establishment nearby and the whole establishment eventually disappears. The paleontologist continues to uncover the footprints and is unsurprised when he finds that the dinosaur is chasing a jeep.

Answer 1

Time's Arrow by Arthur C. Clarke

Fowler is invited to visit Henderson's lab, during which time the two geologists come to believe that the physicist is trying to effectively build a way to view the past firsthand. Henderson confirms their conclusion and asks Fowler to join him during the machine's first test run. The dig continues and the team discovers that the footprints give off the impression that the dinosaur was chasing something. Fowler sets off for the lab via Jeep, shortly after which Davis sees the lab explode and the surrounding area ripple. He returns to alert Barton, who has discovered that the dinosaur tracks are accompanied by Jeep tyre prints, implying that the dinosaur had chased after and subsequently trampled Fowler.

Answer 2

This triggered something deep in my subconscious. I think Time's Arrow is probably the correct answer, but the same scene was (shamelessly copied?) in a Tom Swift & Hardy Boys crossover called Time Bomb I read when I was very young. I can't find much of a plot summary anywhere, but as it appears there were only two such crossover novels, this has to be it.