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Thesis (M.S.)—University of Nebraska—Lincoln, 1953. Department of Geology.


Copyright 1953, the author. Used by permission.


Little work has been done heretofore in the study and description of gastropods that occur with other fossils in the Pennsylvanian rocks exposed in southeastern Nebraska.This is probably due to the fact that the Paleozoic gastropods are a rather difficult group to work with, and also because there are few horizons and localities from which good specimens may be collected in the area.The purpose of the following report is to contribute something to the knowledge of Pennsylvanian gastropod species that occur in the rocks of the age in Nebraska, and to compare these forms with those that have been collected and described in nearby states where Pennsylvanian rocks are also exposed.The gastropod Specimens used in this study were all collected from one locality, the eastern portion of the Snyderville quarry in Cass County, Nebraska.

The stratigraphic level from which the gastropods were collected is at the contact between the Kereford limestone and the overlying Jackson park shale.The Kereford limestone is the top member of the Oread limestone formation, and the Jackson Park shale is the lowest member of the Kanwaka shale formation.Both of these formations are in the Shawnee group of the Virgil series of the Pennsylvanian system.The area from which the collection was made was not large, being about 50 yards long and 25 yards wide.

Advisor: Benjamin H. Burma