......................................................................................................................... . Introduction..................................................................................................................... 2 Organization of This Report . .. . . . . . . .. . . . . . . . . . . .. . . . . .. . . . . . .. .. . . . . . . . . . . . . . .. . . . . . .. . . .. . . . .. . . . . .. . . . . . . 6 Age Assignments and Age of the Froman Ferry Faunas .. . . .... ....... ... ....... ......... ... . 8 Mammal Ages and Provincialism . .. .. .. .. . . . .. . .. ... . . . . . .. .. . . .. . . . .. . . . . . . . . . .. . .. .. ... . . .. .. . ... . . . . . . 10 Dispersal................................................................................................................ 13 Dispersal Events and Faunal Changes ..................... ... ...... .. .... ........ .......... ............ 16 Collections . .. .. . . . . . . .. .. .. . . . . . . . . .. .. . . . . . . .. . . .. . . . . . . . . . .. . .. . . . . . . .. . . .. .. . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . .. . . . . . . 18 Acknowledgments................................................................................................. 18 The Froman Ferry Fauna................................................................................................. 18 Genus Sorex Linnaeus, 1758 ................................................................................. 19 Genus Ischyrosmilus Merriam, 1918 ........ ........... ........... ... .......... .......... ........... .... 20 Genus Puma Jardine, 1834 .................................................................................... 20 Genus Hypo fagus Dice, 1917.................... ... . . . . . . . . . . . . . . . . . .. . .. .. . . . . .. .. . . . . . . . . .. . . .. . . . . . . .. . . . 25 Genus Castor Linnaeus, 1758 ............................................................................... 26 Genus Mictomys True, 1894 .. . ...... ........ ........... ...... ........ .. ......... ......... .. . .......... ... ... 27 Genus Mimomys Major, 1902 ............................................................................... 30 Genus Phenacomys Merriam, 1889 ...................................................................... 32 Genus Ondatra Major, 1902 ................................................................................. 33 Genus Stegomastodon Pohlig, 1912...................................................................... 35 Genus Plesippus Matthew, 1924........................................................................... 35 Specific Nomenclature.................................................................................... 43 Subgeneric Nomenclature ............................................................................... 44 Phylogenetic Summary ................................................................................... 46 Genus Gigantocamelus Barbour and Schultz, 1939 .. ......... ................ ......... ......... 4 7 Family Cervidae Gray, 1821 ................................................................................. 47 Historic Setting of the Froman Ferry Faunal Succession ............................................... 47 Youngest Glenns Ferry Lake Beds . ............ ............. ..... .... . ....... ........ .......... .......... 4 7 Correlation of Youngest Lake Beds................................................................ 50 Snake River and the Glenns Ferry Formation ....................................................... 52 Glenns Ferry Formation ........................................................................................ 53 Glenns Ferry Formation Near Hagerman and King Hill ................................. 55 Lake, Marsh, and Stream Facies, Longitudinal Relationships ........................ 57 Lake, Marsh, and Stream Facies, Transverse Relationships........................... 59 Chattin Hill.............................................................................................. 59 Jackass Butte........................................................................................... 60 Birch Creek ............................................................................................. 61 Regional Facies Relationships .......... ............ ............ ............ ...................... ... 62 Incision of the Lake Beds and Canyon Damming ... .. ..... ....... ..... .... .. ........... ... 64 Adjacent Areas of Significance ............................................................................. 66 Pre-Glenns Ferry Drainage . . ............. .... .. .. . . . . . ... ..... . . . . ............. .... .... . ..... ... . . . . . .. 66 Glenns Ferry Lake Drainage .. . .. .. .. .. .. . .... .. .. .. .. .. . .. .. .. .. .. .. .. .. . .. .. .. .. .. .. .. .. . .. .. .. . .. .. . 69 Conclusions .. . . .. .. .. .. .. . . .. .. . .. . .. . . . . .. .. .. . . . . . . .. .. .. .. .. . . .. . .. .. . . . . . .. .. .. .. .. . . . . .. .. .. .. . . . . .. .. .. .. . . .. .. .. .. . . . . .. . 71 References Cited .. . .. . . .. .. .. .. . .. . . . . .. .. .. . . . . .. . .. .. .. . . . . . .. .. .. .. . . . . .. .. . .. . .. . . . .... .. . . . . . .. .. .. .. .. . . .. .. .. .. . . . . .. . 7 4 Correction........................................................................................................................ 79 Index ................................................................................................................................ 80