Many people hold to the notion that man-like beings existed long before Adam and may even have been his contemporary. The idea is usually hazy and half-formed, while comfort is drawn from the fact that many of the spiritual giants of Christendom have given their approval to pre-Adamic or pre-Adamite man. Those seeking biblical support admit this is not explicit but point out that the Bible makes no claim to be a complete record of the history of the world.
Dobbs, Francis. 1800. A Concise View from History... Dublin: J. Jones.
Fleming, Sir John Ambrose. 1935. The Origin of Mankind viewed from the standpoint of revelation & research. London: Marshall, Morgan & Scott.
1. Archaeopteryx means "early wing" and is the paleontologist's Rosetta stone seemingly providing the perfect evidence for the otherwise elusive transition creatures which should fill the rocks with their fossil remains. First discovered in 1861, it is the purported transition between the dinosaur and the bird; seven specimens are claimed to exist.
Photo: The Berlin archaeopteryx specimen. Courtesy of H. Raab. (CC A-SA 3.0 Unported)
When claims are made that certain animals known only by their fossils are "extinct," all that is really meant is that no living specimens have been found. For example, the oceans are the least explored area of this planet and undoubtedly contain many creatures that are passing into extinction without ever having been discovered. The plesiosaur may possibly be one such example.
Photo: Skeleton of Columbian mammoth. Courtesy of WolfmanSF. (CC-BY-SA 3.0)