Title: A multiproxy environmental investigation of Holocene wood from a submerged conifer forest in Lake Huron, USA
Author: Hunter, R. Douglas; Panyushkina, Irina P.; Leavitt, Steven W.; Wiedenhoeft, Alex C.; Zawiskie, John
Source: Quaternary research. Vol. 66 (2006): pages 67-77.
Description: Remains of a Holocene drowned forest in southern Lake Huron discovered in 12.5 m of water (164 m above sea level), 4.5 km east of Lexington, Michigan USA (Sanilac site), provided wood to investigate environment and lake history using several proxies. Macrofossil evidence indicates a forest comprised primarily of conifers equivalent to the modern “rich conifer swamp” community, despite generally low regional abundance of these species in pollen records. Ages range from 7095 ± 50 to 6420 ± 70 14C yr BP, but the clustering of stump dates and the development of 2 floating tree-ring chronologies suggest a briefer forest interval of no more than c. 400 years. Dendrochronological analysis indicates an environment with high inter-annual climate variability. Stable-carbon isotope composition falls within the range of modern trees from this region, but the stable-oxygen composition is consistent with warmer conditions than today. Both our tree-ring and isotope data provide support for a warmer environment in this region, consistent with a mid-Holocene thermal maximum. This drowned forest also provides a dated elevation in the Nipissing transgression at about 6420 14C yr BP (7350 cal yr BP) in the southern Lake Huron basin, a few hundred years before reopening of the St. Clair River drainage.
Keywords: Lake Stanley, tree rings, stable isotopes, Lake Huron, Holocene, lake levels, Thuja, Paleoclimatology, radiocarbon dating, climatic changes, Michigan, plant communities, Paleoecology, Paleobotany, Paleobiology, fossil trees, carbon isotopes, dendrochronology, tree-rings, Lake Huron
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Hunter, R. Douglas; Panyushkina, Irina P.; Leavitt, Steven W.; Wiedenhoeft, Alex C.; Zawiskie, John 2006. A multiproxy environmental investigation of Holocene wood from a submerged conifer forest in Lake Huron, USA. Quaternary research. Vol. 66 (2006): pages 67-77.
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