Frost, Stanley H., 1939-
M.S. (Master of Science)
Department of Geology
The Miogypsina population examined in this study was collected from the Oligocene-Miocene La Quinta Formation near Simojovel, Chiapas, Mexico. Three hundred thin sections were prepared of specimens from the sampled population. Selected features of the miogypsinid test were then measured and the specimens photographed. Data obtained from the measurements of the test were subjected to several types of statistical analysis, including correlation, principle component analysis, and factor analysis. The end result of these statistical analyses was the grouping of the variables into factors. The statistical analyses indicate that although there is morphological variation within the sampled population, this variation is not excessively large, and most of the variation is random. There are some relationships among the variables but these are relatively weak and not of major significance in taxonomy. The variables that appear to be the most important for taxonomic work are those that deal with the embryonic apparatus of the test, such as the angle of deuteroconch addition (Drooger's 8), protoconch size, and the number of chambers up to and including the largest chamber in the periembryonic spiral (Drooger's Mz). The data obtained in this study can best be correlated with that presented by Drooger (1952; 1963).
Catlin, James E., "Intrapopulational variation in Miogypsina" (1972). Graduate Research Theses & Dissertations. 3629.
vii, 62 pages
Northern Illinois University
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