Paleontology/Introduction/References


 * Guide to Fossils 2003, by Philip's, Octopus Publishing Group Ltd, London. ISBN 0-540-08374-7.


 * McGeary. D and Plummer.C.C (1994), Physicla Geology Earthe revealed, Wm . C. Brown Publishers, Dubuque. ISBN 0-697-12687-0.