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Lab number
Material dated
marine shell; coquillage
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
Marpole / Stselax
Stratigraphic component
Zone A
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.
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.