<sup>14</sup>C Dating of Laser-Oxidized Organics

Watchman, Alan; Lessard, Reno; Jull, A. J. T.; Toolin, L. J.; Blake, Weston

doi:10.1017/s0033822200065024

Cited by 13 publications

(1 citation statement)

References 9 publications

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“…Dorn and others utilized rock varnishes to estimate the ages of petroglyphs by the cation-ratio method (Dorn, 1983) and by radiocarbon dating organic matter trapped in the varnish (Dorn et al, 1989). Watchman et al (1992) demonstrated the feasibility of radiocarbon dating lamina of oxalates in rock crusts associated with rock paintings to estimate ages of the pictographs. More recently, Watchman (1993) reported the age of an ancient pictograph based on 14C dates of oxalate and charcoal laminations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the rock accretions in the lower pecos region of southwest texas

et al. 1995

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Calcium oxalate (whewellite) was found to be the primary component of crusts on limestone in the dry rock shelters throughout the Lower Pecos region of Texas. This material forms a translucent patina that covers the pictographs in this area. Evidence from analyses using SEMIEDS, FTIR, XRD, Raman spectroscopy, and AMS is presented that suggests the oxalate-rich crusts were produced by metabolic activity of lichen or fungi on or near the surface of the limestone substrate. The paucity of hyphae and microbes in samples studied using SEM may indicate that the organisms responsible for the production of the oxalate are no longer present on the shelter walls. Radiocarbon ages of three oxalate samples range from 2100 to 5570 years B.P., indicating that the crust may be used for obtaining chronological information on the rock art. 0 1995 John Wiley & Sons, Inc.

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Section: Introductionmentioning

confidence: 99%