Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level

Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level

Bibliographic Details
Main Author: Fitzgibbon, Holly Ann
Language:English
Published: Ohio University / OhioLINK 2010
Subjects:
Geomorphology
Aggradation
Climate
Incision
Karst
Paleomagnetism
Cave
Speleothem
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289851338
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou12898513382021-08-03T05:46:45Z Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level Fitzgibbon, Holly Ann Geomorphology Aggradation Climate Incision Karst Paleomagnetism Cave Speleothem Evidence of Pleistocene landscape evolution is recorded in sediment packages and cave passage morphologies found in Buckeye Creek Cave (BCC), West Virginia. Sediments and cave passages have been age-dated using U/Th and paleomagnetism so that long-term stream incision rates could be determined. The oldest cave passages are >773000 years old and the youngest passage is still forming. Incision rates calculated for higher, older cave passages are between <27 and <71 meters/million years, which is consistent with rates elsewhere in Appalachia. However, whether BCC incision rates reflect long-term valley incision or karst processes is ambiguous because passages may have been adjusted to a subsurface base level as opposed to a surface channel and valley. This would explain a low incision rate (<27m/Ma) obtained from atop thick sediments in the second lowest passage, 16.3m above the modern stream, and why comparatively little incision has occurred since the original passage floor was excavated. 2010 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289851338 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289851338 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Geomorphology
Aggradation
Climate
Incision
Karst
Paleomagnetism
Cave
Speleothem
spellingShingle Geomorphology
Aggradation
Climate
Incision
Karst
Paleomagnetism
Cave
Speleothem
Fitzgibbon, Holly Ann
Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level
author Fitzgibbon, Holly Ann
author_facet Fitzgibbon, Holly Ann
author_sort Fitzgibbon, Holly Ann
title Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level
title_short Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level
title_full Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level
title_fullStr Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level
title_full_unstemmed Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level
title_sort interpretation of whether incision rates in appalachian karst reflect long-term downcutting toward a surface versus subsurface base level
publisher Ohio University / OhioLINK
publishDate 2010
url http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289851338
work_keys_str_mv AT fitzgibbonhollyann interpretationofwhetherincisionratesinappalachiankarstreflectlongtermdowncuttingtowardasurfaceversussubsurfacebaselevel
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