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The ones in Dinosaur National Park. There's some petroglyphs on a rock somewhere that creationalists claim to have come from the natives who lived there thousands of years ago. Never mind, of course, that Dinosaur National Park is one of the most fossil-laden areas found in the US and that over the past two hundred years there have probably been as many fossil-hunters in the area as scorpions. Also, you'd have to ignore the fact that the petroglyphs look almost exactly like what dinosaurs were thought to have looked like in the late 1800s and early 1900s. Even if the petroglyphs weren't a hoax, chances are they were just some fossil-hunters a hundred years ago who scratched some diagrams on a rock at night beside their campfire.
The creationalist websites I've seen list the petrographs as "Class C or Class D evidence", not to be repeated or used by creationalists in debates because of the weakness of the evidence.