 The date estimate as well as the notion the artifacts were made by some undiscovered culture was rejected by archeologists and paleontologists.The figurines, which most archaeologists dismiss as an elaborate hoax, depict oddities such as dinosaurs coexisting with men and horned humans.In the introduction to later editions of Hapgood's 1973 book, "Mystery in Acambaro", David Hatcher Childress wrote that Hapgood and Gardner thought the figurines were genuine and were evidence that orthodox understandings of dinosaur extinction were wrong.