For many years evolutionists have claimed that of all major groups of plants and animals, the fossil record of the origin of Class Mammalia is easily the best. (Olson, p. 207). However it will be shown that the case for the reptile to mammal transformation is extremely shaky and is based largely on inference, supposition and wishful thinking. Although I quote large-scale time frames and use standard geological terms in respect of epochs, eras and periods, I do not imply my acceptance of the time scales. I use the time periods for the sake of argument, but even so, the fossils do not provide a strong case for evolution.