C14 Radiocarbon Dating - Sample - GX-3428

Shell from the final hearth in a side chamber. PROBLEM: The excavator refers to Geochron using the 'best' half life (presumably 5730) rather than the standard 5568. Thus the conventional radiocarbon age would be even younger than that quoted. PROBLEM: As of 2009, the calibration is uncertain because the marine effect varies (Ascough PhD) and it is not safe simply to correct the age by 405 C14 years

Canmore ID 4121

Map Number NB14SE

Site type Broch (Iron Age)

Site number 1

NGR 119002 941230

Council 410

County 26

Parish UIG

Lab Analysis ID GX-3428

Material Dated shell (Null)

Researcher Tabraham 1979, 160

Sponsor Historic Scotland

Uncalibrated date bp +/- error 650 bp +/-150

Uncalibrated date ad/bc +/- error ad 1300 +/-150

Completed by Geochron Laboratories, USA

Calibration program used OxCal 3.10