Central Washington University ScholarWorks@CWU All Master's Theses Master's Theses 1967 Some Fossil Mollusks of Yakima County, Washington Raymond Deane Foisy Central Washington University Follow this and additional works at: https://digitalcommons.cwu.edu/etd Part of the Science and Mathematics Education Commons Recommended Citation Foisy, Raymond Deane, "Some Fossil Mollusks of Yakima County, Washington" (1967). All Master's Theses. 659. https://digitalcommons.cwu.edu/etd/659 This Thesis is brought to you for free and open access by the Master's Theses at ScholarWorks@CWU. It has been accepted for inclusion in All Master's Theses by an authorized administrator of ScholarWorks@CWU. For more information, please contact
[email protected]. SOME FOSSIL MOLLUSKS OF YAKIMA COUNTY, WASHINGTON A Thesis Presented to the Graduate Faculty Central Washington State College In Partial Fulfillment of the Requirements for the Degree Master of Education by Raymond Deane Foisy July, 1967 NOll::J::lllO::> l\ll::J3dS SbSC? _::1 e· tu,g a'I ii APPROVED FOR THE GRADUATE FACULTY ________________________________ Edward P. Klucking, COMMITTEE CHAIRMAN _________________________________ Donald Baepler _________________________________ Richard E. Mould TABLE OF CONTENTS CHAPTER PAGE I. INTRODUCTION . 1 Discussion of Problem • • • • • • • 1 Procedures for Solving the Problem • • • • • 3 Previous Investigations • • • • • • • • • • • • 5 Acknowledgments • • • • • • • • • • • • • • • • 9 II. GEOLOGY OF THE REGION • • • • • • • • • • • • • • 10 Geography . 10 Climate . 11 Vegetation • . 14 Present Mollusca • . 16 Geology . 17 Structure . 20 Location • • 20 III. COMPOSITION OF FAUNA • . 22 Specimens and Their Condition . 22 Systematic Account • • • • • • • • • 23 IV. ENVIRONMENT OF THE FOSSIL FAUNA • • • • . 29 Relative Abundance of the Species 29 Ecological Indications • • • • 30 Age of Fauna • • • • • • • • • • . 34 iv CHAPTER PAGE v.