—Paleontology is the science of the forms of life existing in former geologic periods, as represented by their fossils.—
I think this is more telling then the picture. Palin-tol-ogy is a refernce to peleontology. The implication being that Palin is a fossil or dinasaour.
I think it is more of a dig at her belief in Creation as opposed to Evolution as the origin of life.