Book contents
- Frontmatter
- Contents
- Contributors
- Preface
- PART I The Chronostratigraphy of the Uintan through Arikareean
- 1 Magnetic stratigraphy and biostratigraphy of the middle Eocene Uinta Formation, Uinta Basin, Utah
- 2 Biostratigraphy and magnetostratigraphy of the Bridgerian-Uintan Washakie Formation, Washakie Basin, Wyoming
- 3 Magnetic stratigraphy, sedimentology, and mammalian faunas of the early Uintan Washakie Formation, Sand Wash Basin, northwestern Colorado
- 4 Theoretical biochronology, the Bridgerian-Uintan boundary and the “Shoshonian Subage” of the Uintan
- 5 Middle Eocene mammalian faunas of San Diego County, California
- 6 Stratigraphy and paleomagnetism of the middle Eocene Friars Formation and Poway Group, southwestern San Diego County, California
- 7 Magnetostratigraphy of the upper middle Eocene Coldwater Sandstone, central Ventura County, California
- 8 Stratigraphy and paleomagnetism of the upper middle Eocene to lower Miocene (Uintan to Arikareean) Sespe Formation, Ventura County, California
- 9 Magnetostratigraphy of the Eocene-Oligocene transition in Trans-Pecos Texas
- 10 Magnetic stratigraphy of the Duchesnean part of the Galisteo Formation, New Mexico
- 11 Stratigraphy and vertebrate faunas of the Bridgerian-Duchesnean Clarno Formation, north-central Oregon
- 12 Eocene-Oligocene faunas of the Cypress Hills Formation, Saskatchewan
- 13 Magnetic stratigraphy of the White River Group in the High Plains
- 14 Magnetostratigraphy and biostratigraphy of the Eocene-Oligocene transition, southwestern Montana
- 15 The Whitneyan-Arikareean transition in the High Plains
- PART II Common Vertebrates of the White River Chronofauna
- Summary
- Index
15 - The Whitneyan-Arikareean transition in the High Plains
Published online by Cambridge University Press: 06 July 2010
- Frontmatter
- Contents
- Contributors
- Preface
- PART I The Chronostratigraphy of the Uintan through Arikareean
- 1 Magnetic stratigraphy and biostratigraphy of the middle Eocene Uinta Formation, Uinta Basin, Utah
- 2 Biostratigraphy and magnetostratigraphy of the Bridgerian-Uintan Washakie Formation, Washakie Basin, Wyoming
- 3 Magnetic stratigraphy, sedimentology, and mammalian faunas of the early Uintan Washakie Formation, Sand Wash Basin, northwestern Colorado
- 4 Theoretical biochronology, the Bridgerian-Uintan boundary and the “Shoshonian Subage” of the Uintan
- 5 Middle Eocene mammalian faunas of San Diego County, California
- 6 Stratigraphy and paleomagnetism of the middle Eocene Friars Formation and Poway Group, southwestern San Diego County, California
- 7 Magnetostratigraphy of the upper middle Eocene Coldwater Sandstone, central Ventura County, California
- 8 Stratigraphy and paleomagnetism of the upper middle Eocene to lower Miocene (Uintan to Arikareean) Sespe Formation, Ventura County, California
- 9 Magnetostratigraphy of the Eocene-Oligocene transition in Trans-Pecos Texas
- 10 Magnetic stratigraphy of the Duchesnean part of the Galisteo Formation, New Mexico
- 11 Stratigraphy and vertebrate faunas of the Bridgerian-Duchesnean Clarno Formation, north-central Oregon
- 12 Eocene-Oligocene faunas of the Cypress Hills Formation, Saskatchewan
- 13 Magnetic stratigraphy of the White River Group in the High Plains
- 14 Magnetostratigraphy and biostratigraphy of the Eocene-Oligocene transition, southwestern Montana
- 15 The Whitneyan-Arikareean transition in the High Plains
- PART II Common Vertebrates of the White River Chronofauna
- Summary
- Index
Summary
ABSTRACT
We bring together lithostratigraphic, biostratigraphic, and magnetostratigraphic data from Nebraska and South Dakota to detail faunal change between 28-30 Ma in medial Oligocene time. This span records the transition from the White River chronofauna to the new assemblages that characterize the younger part of the Arikareean “age.” Although a regional disconformity of approximately a half-million year duration breaks the biostratigraphic sequence, the fossil record is reasonably continuous and mostly confined to the eolian facies. Between 28-30 Ma the White River chronofauna experienced significant enrichment in autochthonous clades especially hesperocyonine canids, oreodonts, camels, hypertragulids, and burrowing castoid and geomyoid rodents. Few allochthonous taxa are encountered so that the chronofauna was enriched without marked immigration or extinction. At approximately 28 Ma most of the White River genera leave the record, thus terminating the chronofauna. The fauna that emerges contains representatives of autochthonous lineages, some of which appeared during the enrichment phase of the White River chronofauna. In addition there are allochthonous genera that represent taxa new to midcontinental North America. The better resolved and calibrated fossil record allows re-examination of the definition and characterization of the beginning of the Arikareean mammal “age.” We propose that the initiation of the Arikareean Mammal “age” is signaled by the first appearance of taxa that enrich the White River chronofauna in latest Chron C11r and earliest Chron C11n (about 30 Ma).
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- The Terrestrial Eocene-Oligocene Transition in North America , pp. 312 - 334Publisher: Cambridge University PressPrint publication year: 1996
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