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- Lab number
- Beta-258425
- Material dated
- bone
- Type of date
- archaeological
- Submitter
- Jeff Rasic, NPS
- Uploader
- A. Martindale
- Date uploaded
- March 23, 2015
- Measured Age
- 0
- Normalized Age
- 0
- Context
- AMR-185, Test Pit 1
- Comments
- Juvenile caribou metatarsal (left side) collected from a shovel test pit on terrace on Matcharak Lake. Additional lithic and faunal material actively eroding from terrace edge. Collected by AT 7/10/2008. See AT field notes. Identified by S. Shirar 4/14/2009. 6.7g sample removed for dating 4/14/2009. Result: 151.6 +/- 0.6 pMC -- "You will notice that Beta-258425 (GAAR 16790.01) is reported with the units “pMC” rather than BP. “pMC” stands for "percent modern carbon". Results are reported in the pMC format when the analyzed material had more 14C than did the modern (AD 1950) reference standard. The source of this "extra" 14C in the atmosphere is thermo-nuclear bomb testing which on-set in the 1950s. Its presence generally indicates the material analyzed was part of a system that was respiring carbon after the on-set of the testing (AD 1950s). On occasion, the two sigma lower limit will extend into the time region before this "bomb-carbon" onset (i.e. less than 100 pMC). In those cases, there is some probability for 18th, 19th, or 20th century antiquity."