Introduction to Palaeontology/References
< Introduction to Palaeontology- 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.
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