Radiocarbon Assays from Horn Shelter: Paleoindian Strata

C14 Years BP Calendar Age Calendar Age Material Lab# Strat. References
(Uncalibrated ) (Cal. BP 1-sigma range) (Cal. BC/AD)        
8,400 110 9,250 to 9,490 7,300 to 7,530 BC snail shell (Tx-1996) 8B Valastro et al. 1979
9,500 ± 200 10,530 to 11,090 8,580 to 9,140 BC charcoal (Tx-1830) 5G Valastro et al. 1979
9,690 50 *** *** human bone (CAMS-51794) 5G Owsley et al. 2010
9,710 40 *** *** human bone (CAMS-60681) 5G Owsley et al. 2010
9,980 370 10,985 to 12,200 9,035 to 10,250 BC wood charcoal (Tx-1722) 5G Valastro et al. 1979
10,030 130 11,080 to 12,270 9,130 to 10,320 BC snail shell (Tx-1998) 5G Valastro et al. 1979
10,150 120 11,500 to 12,050 9,550 to 10,100 BC turtle bone (apatite) (Tx-2189) 3 Valastro et al. 1979
10,310 150 11,790 to 12,450 9,840 to 10,500 BC snail shell (Tx-1997) 5G Valastro et al. 1979
10,600 180 12,180 to 12,700 10,230 to 10,750 BC charcoal (CAMS-395) 7/3* TARL Archives

* Sample taken from hearth feature at juncture of Stratum 3 and Stratum 7 (Center for Mass Spectrometry, Lawrence Livermore National Laboratory, 1990; TARL Archives). Radiocarbon assays calibrated at one-sigma range (68% probability) using the online Cologne Radiocarbon and Paleoclimate Research Package (CalPal). Learn more about "Radiocarbon Dating, Years ago, and Calendar Years" on Texas Beyond History.