Stratigraphy, paleomagnetism, and cosmogenic-isotope burial ages of fossil-bearing strata within Riverbluff Cave, Greene County, Missouri.
Riverbluff Cave, in Greene County, Missouri, is a short single passage between the James River and its direct tributary, Ward Branch. Before stream incision the cave functioned as a spillway/piracy between the two streams during high-discharge events and accumulated a sequence of stratified fluvial...
| Publicado en: | Quaternary Research Vol. 87; no. 3; pp. 516 - 529 |
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| Autores principales: | , , , |
| Formato: | Artículo |
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Cambridge University Press
May2017
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=124102599&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 124102599 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00335894 2AW jtl: Quaternary Research issn: 00335894 maglogo: N pubinfo: dt: May2017 vid: 87 iid: 3 pid: 15979 pub: Cambridge University Press artinfo: ui: 124102599 10.1017/qua.2017.14 ppf: 516 ppct: 13 formats: tig: atl: Stratigraphy, paleomagnetism, and cosmogenic-isotope burial ages of fossil-bearing strata within Riverbluff Cave, Greene County, Missouri. aug: au: Rovey, Charles W. Balco, Greg Forir, Matt Kean, William F. affil: Department of Geography, Geology, and Planning, Missouri State University, 901 S. National, Springfield, Missouri 65897, USA Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA Missouri Institute of Natural Science, 2327 W. Farm Road 190, Springfield, Missouri 65810, USA Department of Geosciences, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201, USA su: Stratigraphic geology Paleomagnetism Cosmogenic nuclides Caves Sediment transport Missouri sug: subj: Missouri Stratigraphic geology Paleomagnetism Cosmogenic nuclides Caves Sediment transport keyword: Burial dating Mammoths Riverbluff Cave ab: Riverbluff Cave, in Greene County, Missouri, is a short single passage between the James River and its direct tributary, Ward Branch. Before stream incision the cave functioned as a spillway/piracy between the two streams during high-discharge events and accumulated a sequence of stratified fluvial sediments within the cave. Five cosmogenic-nuclide burial ages for these sediments range from 0.984 to 0.570 Ma. These ages are consistent with both the stratigraphic order of the samples and the inferred position of the Matuyama/Brunhes paleomagnetic boundary. These ages indicate that sandy channel-facies deposits derived from Ward Branch entrances began to accumulate within the cave as early as 0.984±0.065 Ma. This facies is capped by highly fossiliferous gravel beds dated at 0.658±0.065 Ma, which contain abundant mammoth bones (possibly <italic>Mammuthus trogontherii</italic>) and other vertebrates. The high concentration implies that this deposit may record some type of mass-mortality event. By 0.570±0.072 Ma, all Ward Branch entrances had been abandoned because of incision, and a laminated red clay derived from backflow from flooding along the James River capped the older channel sediments. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2017 holdings: @attributes: islocal: N |
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