There have been claims that the Kachina Bridge petroglyph, which looks like a dinosaur, is actually a combination of two meaningless petroglyphs and a mud stain. Vance Nelson has carried out a detailed study of the petroglyph, and has written a report with illustrations that refutes these claims. Read Vance’s report here
For more information on dinosaurs in ancient artwork see the superbly illustrated book Untold Secrets of Planet Earth: Dire Dragons by Vance Nelson Available from Creation Research webshop
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