REFERENCES CITED

Boardman, Richard S., Cheetham, Alan H. & Rowell, Albert J. (1987). Fossil Invertebrates. Blackwell Scientific Publications. Palo Alto, California.

Clarkson, E. N. K. (1986). Invertebrate Paleontology and Evolution. Allen & Unwin Ltd. London.

Eldredge, Niles. (1991). Fossils:The Evolution and Extinction of Species. Harry N. Abrams, Inc. New York.

McRoberts, Christopher. (1998). Laboratory Notes. Invertebrate Paleontology. State University of New York, College at Cortland.

Stanley, Steven M. (1993). Exploring Earth and Life Through Time. W. H. Freeman and Company. New York.

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