1. Δ14C PEAKS APPEARING IN EARLYWOOD AND LATEWOOD TREE RINGS (AD 770–780) IN NORTHEASTERN ARIZONA
- Author
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K H Sung, Jeong-Wook Seo, Junghun Park, G Park, W Hong, P P Creasman, and John Southon
- Subjects
Canyon ,010506 paleontology ,Archeology ,geography ,geography.geographical_feature_category ,Late winter ,Pinus edulis ,01 natural sciences ,food.food ,law.invention ,National monument ,food ,Cave ,law ,High latitude ,0103 physical sciences ,General Earth and Planetary Sciences ,Radiocarbon dating ,Physical geography ,010303 astronomy & astrophysics ,Geology ,0105 earth and related environmental sciences - Abstract
The AD 775 peak in Δ14C (henceforth, M12) was first measured by Miyake et al. and has since been confirmed globally. Here we present earlywood and latewood Δ14C values from tree rings of pinyon pine (Pinus edulis) from Mummy Cave, Canyon de Chelly National Monument, Chinle, Arizona, USA, for the period AD 770–780. These data reconfirm the timing of M12 and show a small rise in Δ14C in AD 774 latewood. Allowing for the delay in lateral transfer of radiocarbon produced at high latitude, this suggests that 14C peak production occurred in late winter or spring of AD 774. Additionally, Δ14C decreased slightly in the earlywood of AD 775 and increased in the latewood of AD 775 to a higher level than that observed in AD 774.
- Published
- 2020