Alt Title

A statistical study of microfossils by application of mass data processing and computer techniques

Publication Date


Document Type


First Advisor

Frost, Stanley H., 1939-||Rubel, Daniel N.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Geology


Geology; Paleontology--Eocene


Samples of Lepldocvcllna (Leoldocycllna) macdonaldi from the late Eocene of Central America were investigated and compared statistically by analysis of variance. Samples were studied from collecting localities at Ixtapa and Simojovel in the State of Chiapas, Mexico. It was considered necessary to take into account measurements of all aspects of the test. Two of these parameters, relationship of protoconch to duteroconch and type of periembryonic chambers, showed no significant variation at the specific level. Two other parameters, height of the fifth equatorial chamber and height of lateral chambers, proved to yield significant variation for every comparison made. Significant morphological variation was found between specimens from Ixtapa and Simojovel. Significant morphological variance was also found between specimens from two collecting localities near Simojovel as compared with all the others. The simple analysis of variance was found to yield valid results while the complex analysis of variance did not. The objective approach was postulated as being necessary for definition and re-examination of low level taxa.


Includes bibliographical references.||Includes illustrations and map.


iv, 58 pages




Northern Illinois University

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