Constraining the age of rock art by dating a rockfall event using sediment and rock-surface luminescence dating techniques |
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| Institution: | 1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, DK-4000 Roskilde, Denmark;2. Utah State University 4505 Old Main Hill, Logan, UT 84322, United States;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, USA;3. School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou, China;1. Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, 1012, Switzerland;2. Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern, 3012, Switzerland;1. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, Denmark;3. Department of Earth Sciences, ETH-Zurich, 8092 Zurich, Switzerland;1. Department of Geography and Earth Sciences, Aberystwyth University, Ceredigion, SY23 3DB, UK;2. Department of Geography and Planning, University of Liverpool, Liverpool, L69 3BX, UK;1. University of the Aegean, Department of Mediterranean Studies, Laboratory of Archaeometry, 1 Demokratias Str, Rhodes 85131, Greece;2. Institute of Nuclear Sciences, Ankara University, 06100 Be?evler, Ankara, Turkey;3. University of California San Diego, Department of Anthropology, San Diego, USA |
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| Abstract: | Optically stimulated luminescence (OSL) is used to determine the age of a rockfall event that removed part of the pictograph figures at the Great Gallery rock art panel in Canyonlands National Park, Utah, USA. Analyses from the outer millimeter of the buried surface of a rockfall boulder and quartz grains from the underlying sediment both provide consistent ages that also agree with an AMS radiocarbon age of a cottonwood leaf found immediately between the clast and underlying sediment. Measurement of the OSL signals as a function of depth into the surface of the boulder clearly shows that there is no detectable increase in the OSL signal to a depth of at least 3 mm suggesting that the OSL signal was fully reset to this depth before burial. Consistent OSL and radiocarbon ages for this rockfall event provide a minimum age of ～900 a for the Great Gallery, which is the type locality of Barrier Canyon Style rock art with a controversial and unknown origin. |
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