Journal
QUATERNARY GEOCHRONOLOGY
Volume 10, Issue -, Pages 399-405Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2011.11.006
Keywords
IRSL Dating; Rock alignments; Anomalous fading; Age distributions; Single-grain dating
Funding
- Direct For Social, Behav & Economic Scie
- Division Of Behavioral and Cognitive Sci [0909553] Funding Source: National Science Foundation
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Anthropogenic rock alignments, both circular and linear, are common in the northern Rockies and adjacent High Plains of North America. Their ages are largely unknown. Luminescence dating of single-grain feldspars is applied to sediment under the rocks on the assumption that prior to rock placement turbation processes zeroed sufficient number of grains and that these processes ended with the rock placement. Ages of single grains are corrected for anomalous fading and the age of placement is estimated using the minimum age model. Vertical distributions of ages show that youngest ages are clustered just under the rock, conforming to the turbation model. Low precision in fading corrections led to attempts to reduce fading with higher temperature stimulations. These did reduce fading but also recovered known doses poorly, suggesting possible age over-estimation. This uncertainty coupled with a problem of small sample sizes from material with generally low sensitivity resulted in overall low precision in ages, but still an improvement over the current lack of chronological information. (C) 2011 Elsevier B.V. All rights reserved.
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