首页   按字顺浏览 期刊浏览 卷期浏览 Analysis of the rock accretions in the lower pecos region of southwest texas
Analysis of the rock accretions in the lower pecos region of southwest texas

 

作者: Jon Russ,   Russell L. Palma,   David H. Loyd,   Dennis W. Farwell,   Howell G. M. Edwards,  

 

期刊: Geoarchaeology  (WILEY Available online 1995)
卷期: Volume 10, issue 1  

页码: 43-63

 

ISSN:0883-6353

 

年代: 1995

 

DOI:10.1002/gea.3340100104

 

出版商: John Wiley&Sons, Inc.

 

数据来源: WILEY

 

摘要:

AbstractCalcium 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 SEM/EDS, 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 ar

 

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