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- Lab number
- SFU-267
- Material dated
- peat; tourbe
- Locality
- about 25 km south-southwest of the main peak of Mount Edziza, 4-5 m above Point Creek, Stikine drainage, British Columbia
- Map sheet
- 104 G/07
- Date uploaded
- February 14, 2020
- Normalized Age
- 0 ± 0
- δ13C (per mil)
- -27.0
- Significance
- geoarchaeology; géoarchéologie
- Context
- 20 cm depth, directly above Ash 3
- Comments
- HiTp-no #, "Raspberry Bog": The Raspberry Bog section consists of a 1.5 x 3 m cut, up to 2 m deep, excavated from the edge of a small stream gully. The bog itself occupies a low sloping sandy terrace surface, and the cut was extended well back into the bog in order to determine if there was any evidence of solifluction which might have disturbed the stratigraphic relationship of the ash layers. The only indication of such disturbance consisted of an apparent solifluction fold in the highest ash layer (Ash 4), exposed in the east wall of the cut. All other ashes maintained their vertical relationships as consistent unbroken horizontal layers throughout the length and width of the cut. A complete monolith was removed for palynological analysis by Dr. R. Mathewes, and additional samples were collected for petrographic and radiocarbon analysis. Six radiocarbon dates were obtained (SFU-146, and SFU-263 through -267 [misquoted as SFU-163 through -167 in Fladmark 1985]). SFU-146 dates the basal sediments and provides a minimum age for stabilization of modern drainage and slopes as well as the beginning of organic sedimentation at modern tree line. SFU-266 underlies the lowest ash layer (Ash 1) and is too recent in comparison with SFU-263 recovered just above Ash 1. SFU-264 was 5 cm above SFU-263 and directly beneath a massive fall of coarse tephra (Ash 2). Ash 2 is directly oberlain by a visually distinctive tephra (Ash 3), dubbed "the cinder layer," and SFU-267 from directly above Ash 3 produced a Modern date suggesting either solifluction disturbance or modern root growth. SFU-265, about 15 cm higher in the section, just below the surface and just above the highest ash (Ash 4) also produced a Modern date.