Briggs, D. E. G., Erwin, D. H., and Collier, F. J. The Fossils of the Burgess Shale Washington: Smithsonian Institute Press.

Erwin, D, Valentine, J. and Jablonski D. 1997. The origin of animal body plans. American Scientist. 85(2):126-137.

Gore, R. 1993. Explosion of life. National Geographic. 184(4):120- 135.

Gould, S. J. 1989. Wonderful Life

Human, K. 1997. New fossil worms in. Earth. 6(2): 12.

Morris, S. C. 1993. The fossil record and early evolution of the Metazoa. Nature. 361(21 Jan):219-225.

Narbonne, G. M., Kaufman, A. J., and Knoll, A. H. 1994. Geological Society of America Bulletin. 106:1281-1292.

Nash, M. 1995. When life exploded. Time. 146(23):38-46.

Walker, M. 1995. Faecal pellets and world events. Nature. 376(6 Jul)16.

Wright, K. 1997. When life was odd. Discover. 18(3):52-61.

Image sources

Dott, R. H. and Prothero, D. R., eds.1994. Evolution of the Earth. New York: McGraw Hill, Inc.

Kaufman, A. J. 1997. An ice age in the tropics. Nature. 386(20, Mar):227-228.

Psihoyos, L. 1994. Hunting Dinosaurs. New York: Random House.