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Canada / BC / DhRq-22 (Park Farm) / GSC-6207
- Lab number
- GSC-6207
- Field number
- CIA-96-105
- Material dated
- wood; bois
- Locality
- north edge of Pitt Meadows Highland, south of Katzie Slough, 3 m asl, Fraser River valley, British Columbia
- Map sheet
- 92 G/07
- Date submitted
- September 11, 0098
- Date uploaded
- February 14, 2020
- Normalized Age
- 4030 ± 80
- δ13C (per mil)
- -26.1
- Significance
- geoarchaeology; géoarchéologie
- Context
- branch in sandy silt, 1 m depth in a backhoe trench
- Comments
- DhRq-22, Park Farm, comments (J.J. Clague and T. Spurgeon): GSC-6207 and GSC-6209 were collected from adjacent backhoe trenches on the floodplain of the Pitt/Alouette Rivers. The date site is adjacent to the Park Farm archaeological site (DhRq-22) which contains prehistoric cultural materials spanning the period from 4170 BP (SFU-405) to 300 BP (Beta-80773) and representing the Charles, Locarno, Marpole, and Developed Coast Salish phases. The dated material in both trenches was collected from the base of the Holocene sedimentary sequence, just above late Pleistocene(?) deltaic sands (part of Sumas Drift). The GSC dates record progressive aggradation of the Pitt River floodplain as sea level rose relative to the land during late Holocene time. Alluvial or estuarine mud built up against the buried Pleistocene high at this site as the sea rose. Sea level was probably about 2-3 m below present 5500 radiocarbon years ago and 1 m below present 4000 radiocarbon years ago.