Abstract:
Electron spin resonance (ESR) dating was conducted for some ungulate tooth enamel samples and shell fossils of the Tham Lod rockshelter Area I (S23W10) located in Highland Archaeology Project in Pang Mapha District, Mae Hong Son Province, North Thailand. Age estimation for wave-induced breaching of the cavity and initial sand deposition (Level 19-29) was 33,200 - 18,700 years for teeth enamel. The estimate age of the shell fossils was found to be 32,300 years for Nodularia sp. (Carditidae). Result of ESR Septrum was g-factor g[subscript 1] (g[subscript ii]) = 2.0040-2.0041, g[subscript 2] (g[subscript center]) =2.0030-2.0036 and g[subscript 3] (g[subscript I) = 1.997 - 1.9988 formed by CO[superscript -] [subscript 2] Orthorhombic free radical for teeth enamel and g-factor g(g [subscript center]) = 2.0042+-0.0003 formed by SO[superscript-] [subscript3] free radical for fresh shell fossils.