A review of the history of paleoanthropology leads to the conclusion that the discipline is far less objective than that for physics, chemistry, or even biology. The field is rife with controversy and fraud, including outright faking. Classic examples include Piltdown man and Hesperopithecus, but many other less well-known examples exist that are reviewed in this paper. Several well-documented examples are cited in some detail to illustrate the types of problems encountered, and the results of fraud in paleoanthropology.
http://www.answersingenesis.org/articles/arj/v2/n1/controversy-in-anthropology