Rujukan Geokronologi

  1. ↑ David Weishampel:The Evolution and Extinction of the Dinosaurs, 1996, Cambridge Press, ISBN 0-521-44496-9
  2. ↑ Julia Jackson: Glossary of Geology, 1987, American Geological Institute, ISBN 0-922152-34-9
  3. ↑ Smith, J.B., Lamanna, M.C., Lacovara, K.J., Dodson, P. Jnr., Poole, J.C. and Giegengack, R. 2001. A Giant Sauropod Dinosaur from an Upper Cretaceous Mangrove Deposit in Egypt. Science, 292, 1704-1707