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Canada / AB / DjOw-1 (Fletcher) / RL-560
- Lab number
- RL-560
- Material dated
- bison bone collagen; collagène osseux de bison
- Taxa dated
- Bison sp.
- Locality
- north edge of Chin Coulee, 50 km south-southeast of Taber, Alberta
- Map sheet
- 72 E/12
- Submitter
- J.M. Quigg
- Date submitted
- January 5, 0098
- Measured Age
- 5960 ± 170
- Normalized Age
- 6040 ± 170
- δ13C (per mil)
- -20.0
- Significance
- Palaeoindian, Cody, anomalous, young; Paléoindien, anormal, jeune
- Stratigraphic component
- Test 5, Level 11
- Context
- test 5, level 11, mottled dark grey and rust coloured sand, 165-170 cm depth, split of sample dated by S-1083
- Associated taxa
- Mammalia: Bison sp, Odocoileus sp
- Additional information
- It is assumed that this date was not corrected previously for isotopic fractionation.
- Comments
- DjOw-1, Fletcher: This Cody complex bison kill site was discovered 1963 by Armin Dyck after Mr. Fletcher had dug a borrow pit in which to water his cattle. Possibly due to the influence of cattle urine and excrement, the site has been extraordinally difficult to date by radiocarbon. The bones submitted for dating were somewhat permineralized, with manganese enrichment subsequently being demonstrated by neutron activation analysis (Wilson, et al. 1991: 130). Furthermore, the method of collagen extraction in use at the time employed the insoluble concentrate for radiocarbon dating, and this method was subsequently abandoned when it was realized that potential contaminants might remain in the samples at variable concentrations. The Fletcher site was restudied in 1987 and 1988, during which a sample of sedge seeds was isolated from silty clay that underlies the bone bed. An accelerator mass spectrometry date on the seeds appears to provide an acceptable limiting date on the age of the bison kill.