Beta Analytic Radiocarbon Dating Laboratory

CALIBRATION OF RADIOCARBON AGE TO CALENDAR YEARS(Variables: C 13/C 12=-9.9:lab. mult=l)Laboratory number: Beta-259068 /"

BETA ANALYTIC INC.DR. M.A. TAMERS and MR. D.G. HOOD4985 S.W. 74 COURTMIAMI, FLORIDA, USA 33155PH: 305-667-5167 FAX:305-663-0964beta@radiocarbon.comREPORT OF RADIOCARBON DATING ANALYSESMs. Justine McKnightReport Date: 5/26/2009Archaeobotanical ConsultingMaterial Received: 4/28/2009Sample DataMeasuredRadiocarbon Age13C/12CRatioConventionalRadiocarbon Age(*)Beta-259068 140+/-40BP -9.9_o4ao 390+/-40BPSAMPLE: 18CV171FS616ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AE> 1440 to,1540 (Cal BP 510 to 420) AND Cal AD 1540 to 1630 (Cal BP 400 to 320)Beta-259069 600+/-40 BP -25.9 o/ooSAMPLE: 18FR18Feal7ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 1290 to 1420 (Cal BP 660 to 530)590 +/- 40 BPBeta - 259070 650 +/- 50 BP -27.3 o/ooSAMPLE: 18ST2HEARTHANALYSIS : Radiometric-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 1280 to 1420 (Cal BP 670 to 530)620 +/- 50 BPBeta-259071 120+/-40BP -9.9 o/ooSAMPLE: 18ST570FS380ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 1440 to 1640 (Cal BP 510 to 310)370 +/- 40 BPDates are reported as RCYBP (radiocarbon years before present,"present" = AD 1950). By international convention, the modernreference standard was 95% the 14C activity of the National Instituteof Standards and Technology (NIST) Oxalic Acid (SRM 4990C) andcalculated using the Libby 14C half-life (5568 years). Quoted errorsrepresent 1 relative standard deviation statistics (68% probability)counting errors based on the combined measurements of the sample,background, and modern reference standards. Measured 13C/12Cratios (delta 13C) were calculated relative to the PDB-1 standard.The Conventional Radiocarbon Age represents the MeasuredRadiocarbon Age corrected for isotopic fractionation, calculatedusing the delta 13C. On rare occasion where the ConventionalRadiocarbon Age was calculated using an assumed delta 13C,the ratio and the Conventional Radiocarbon Age will be followed by "*".The Conventional Radiocarbon Age is not calendar calibrated.When available, the Calendar Calibrated result is calculatedfrom the Conventional Radiocarbon Age and is listed as the"Two Sigma Calibrated Result" for each sample.