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- Lab number
- Beta-71114
- Material dated
- marine shell; coquillage
- Locality
- north of Point Roberts, ca. 2 m asl, Strait of Georgia, British Columbia
- Map sheet
- 92 G/03
- Date submitted
- February 13, 0097
- Date uploaded
- February 14, 2020
- Measured Age
- 3680 ± 80
- Normalized Age
- 1830 ± 60
- Significance
- Marpole / Stselax
- Stratigraphic component
- Zone A
- Context
- Zone A, unit A27, bottom of Layer AB, directly on top of Ah horizon (Layer AC)
- Additional information
- The authors suggest a correction for the marine reservoir effect to 1439 +/- 60 BP, implying that this is a normalized age.
- Comments
- DgRs-2, Tsawwassen: The excavaters distinguish seven zones (A-G), each with its own stratigraphic and cultural sequence. R. Brolly (p.c. 1999) examined the reports from the Beta laboratory and confirmed that the dates on human bones are uncorrected ages. These must be normalized by adding at least 100 years to the mean, but they cannot be precisely corrected for isotopic fractionation in the absence of measured C-13 ratios.