The Beringian ancestry of Phenacomys (Rodentia: Cricetidae) and the beginning of the modern Arctic Ocean borderland biota

Abstract

Introduction 1 Acknowledgments 2 Mammals of the Fish Creek Fauna 3 Genus Phenacomys Merriam 4 Phenacomys gryci Repenning, n. sp. 6 Genus Cromeromys Zazhigin 7 Ostracodes of the Fish Creek section 11 Basal assemblage 11 Upper assemblage-the Fish Creek Fauna 14 Mollusks of the Fish Creek Fauna 14 Flora of the Fish Creek section 18 Correlation in the Arctic Ocean Borderland 20 Age of the Fish Creek Fauna 20 Age of the Ocean Point Fauna 24 Age of the Cape Deceit Fauna 24 Age of the Krestovka Section 25 Age of the Kap Kobenhavn Fauna 25 Environment of the Arctic Ocean Borderland between 3.0 and 1.9 Ma 26 References cited 27 Index 29 PLATE [Plate follows index] 1. Scanning electron micrographs of diagnostic ostracode species from Fish Creek section. Contents Ill IV Contents