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- Lab number
- GSC-612-2
- Material dated
- bison bone collagen; collagène osseux de bison
- Taxa dated
- Bison bison occidentalis
- Locality
- Bow River, Cochrane, Alberta
- Map sheet
- 82 O/01
- Submitter
- A.M. Stalker
- Date submitted
- March 8, 0098
- Measured Age
- 7220 ± 480
- Normalized Age
- 7300 ± 480
- δ13C (per mil)
- -20.0
- Significance
- palaeobiology, anomalous, young; paléobiologie, anormal, jeune
- Context
- cross-bedded, sandy alluvium, 2 m depth, in the Bighill Creek Formation
- Associated taxa
- Mammalia: Bison bison occidentalis
- Comments
- EhPo-VP, Griffin Pit: Vertebrates were recovered from the Bighill Creek Formation, exposed in a gravel pit in the middle of three postglacial terraces of the Bow River. The surface of the terrace lies about 23 m above the river and about 8 m below the highest terrace. The vertebrate remains occur in cross-bedded, sandy alluvium about 2 m below the terrace surface. Three discordant ages have been obtained from this pit. GSC-612 and GSC-612-2 are based on two preparations of crushed bone from the same field sample, the pre-treatment procedure differing including a 24-hour leach in 0.1N NaOH for the latter. GSC-988 omitted the NaOH leach and employed bones collected in later field seasons. While it is possible that the Griffin pit contains fossil beds of different ages (Lowdon and Blake, 1975: 18), this would not seem to explain the 3500 year difference in age between two preparations from a single field sample. Contamination during preparation was offered as a possible explanation for the youngest age (Lowdon and Blake, 1970: 68), and Churcher and Stalker believe that the oldest date "should be favoured for the age of the chief bone bed in the Cochrane terraces" (Lowdon and Blake, 1975: 18).