Can't Remember the Title--a SF Novel

I'm trying to remember the title and author of a book where the characters were thrust (or entered) a dinosaurian age where they were hunters, or some such, and they had to stay on an assigned trail or walkway to keep safe from dinosaur attack. I believe they were hunters and had to follow this course (trail) to complete the expedition. This walkway served as a safety measure, when they had to return from a hunt. It was a riveting read and it just doesn't register what it was called and who wrote it. I'm sure it was a big hit.

Ray Bradbury's Sound of Thunder short story.

Sounds like A Sound of Thunder by Ray Bradbury. A short story.

>3 HatakeKinume: Thanks very much. I've been away and ill for a very long time. But that sounds like the story.