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- Lab number
- GSC-520
- Material dated
- charred wood; bois carbonisé
- Locality
- 30 m above left bank of Lochnore Creek, east side of Fraser River, British Columbia
- Map sheet
- 92 I/12
- Date submitted
- July 26, 0099
- Date uploaded
- February 14, 2020
- Normalized Age
- 2680 ± 100
- δ13C (per mil)
- -25.0
- Significance
- Shuswap
- Context
- log, Zone Ic, bottom of housepit 2, 1.85-2.00 m depth
- Additional information
- Aliquot of GX-407, given acid leach only, delivered to GSC after pre-treatment.
- Comments
- EdRk-7, Lochnore Creek: Originally occupying an area of almost 200 x 75 m, the site was reduced to about 60 x 50 m by the construction of three roads prior to 1964. The site is now destroyed, having been bulldozed and put under cultivation (Sanger 1970: 21). I-2085 consisted of charred wood from the floor of housepit 4. The date seems too recent, because the assemblage was thought to be older than that associated with housepit 2 (Sanger 1970: 104). Housepit 2 yielded a number of charcoal samples from the earliest housepit component, which was the most recent of three components at the site. One of these samples was split to produce GSC-407 and GX-407, dates that differ by 600 years. Re-runs produced GSC-407-2 and GX-407-2, with good intra-lab agreement but similar interlab discrepancy. In a concerted effort to resolve the discrepancy, Geochron sent GSC another unused portion of the sample that produced agreement with the GSC results (GSC-520). A portion of the same field sample also yielded I-1866, in agreement with the GSC dates. In conclusion, a date of 2600 to 2700 years ago is accepted for Zone Ic of the Lochnore Creek site, with the other subzones, Ia and Ib, being more recent (Sanger 1970: 104). A summary of the dates appeared in Radiocarbon 11: 33, 1969: Sample No. Lab. No. Treatment Age (yrs BP) ------------------------------------------------------------- EdRk-7-1962-7 GSC-407 Standard 2670 ± 130 GSC-407 2 Untreated 2600 ± 140 I-1866 Untreated 2680 ± 100 EdRk-7-7b-1962 GX-0407 Acid leach only 3280 ± 125 GX-0407 Acid leach only 3220 ± 90 GSC-520 Acid leach only 2680 ± 130