Accelerator Radiocarbon Date Indicates Mid-Holocene age for Hickory Nut from Indiana Late-Glacial Sediments

Jackson, Stephen T.; Whitehead, Donald R.; Davis, Owen K.

doi:10.1016/0033-5894(86)90062-1

Cited by 7 publications

(1 citation statement)

References 6 publications

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“…A mixture of both identified and unidentified materials would have yielded a spurious date for the interval. Thus, it is critically important to date identifiable plant remains so that contextual relevance can be judged (Jackson et al, 1986). In this instance, the climatic indicators (boreal macrofossils) are the material dated and questions of association do not arise because these taxa are not in the modern flora.…”

Section: Methods and Resultsmentioning

confidence: 99%

Younger Dryas Climatic Reversal in Northeastern USA? AMS Ages for an Old Problem

et al. 1990

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Late-glacial macrofossils from a 10-m core from Alpine Swamp, New Jersey, were radiocarbon dated using accelerator mass spectrometry (AMS). The arrival of the first trees to the area following deglaciation is indicated by maximum percentages of spruce pollen and a date of 12,290 ± 440 yr B.P. on a single spruce needle. Subsequent spread of deciduous hardwoods was followed by the expansion of boreal taxa, including spruce (Picea), fir (Abies), larch (Larix laricina), paper birch (Betula papyrifera), and alder (Alnus). Three AMS dates on paper birch seeds and a spruce needle during this boreal expansion indicate that it took place between 11,000 and 10,000 yr B.P. The timing of this vegetational shift and its correlation with late-glacial pollen stratigraphy from many sites in southern New England indicate that a climatic reversal correlative with the Younger Dryas characterized the North Atlantic seaboard of the United States.

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Section: Methods and Resultsmentioning

confidence: 99%

Younger Dryas Climatic Reversal in Northeastern USA? AMS Ages for an Old Problem

et al. 1990

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Late Wisconsinan Vegetation and Environment of the Tunica Hills Region, Louisiana/Mississippi

Jackson

Givens

1994

Quat. res.

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Pollen, plant macrofossil, and radiocarbon-dating studies of seven exposures of fluvial sediments in the Tunica Hills region of southeastern Louisiana and southwestern Mississippi provide new information on late Wisconsinan vegetation, flora, and environment of the region. The assemblages date between 25,250 and 17,530 yr B.P. Pollen and macrofossil assemblages are dominated by Picea, which comprises 40-70% of the pollen assemblages. Abies and Larix pollen and macrofossils are absent, in contrast to sites to the north in the central Mississippi Valley. Deciduous hardwoods (Quercus, Fagus, Fraxinus, Carya, Juglans nigra, Acer, Ulmus) are minor components of both pollen and macrofossil assemblages. Radiocarbon dates of Picea and Quercus wood indicate that these two genera grew contemporaneously in the region. Regional upland forests were dominated by Picea. Picea cones and cone fragments are not typical of any extant North American species, and probably represent either an extinct species or an extinct variety or subspecies of Picea glauca. Late Wisconsinan climate of the region was cooler than present, but not necessarily as cool as implied by P. glauca or other "boreal" taxa.

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Major Contributions of Radiocarbon Dating to Palynology: Past and Future

Peteet¹

1992

Radiocarbon After Four Decades

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Accelerator Radiocarbon Date Indicates Mid-Holocene age for Hickory Nut from Indiana Late-Glacial Sediments

Cited by 7 publications

References 6 publications

Younger Dryas Climatic Reversal in Northeastern USA? AMS Ages for an Old Problem

Younger Dryas Climatic Reversal in Northeastern USA? AMS Ages for an Old Problem

Late Wisconsinan Vegetation and Environment of the Tunica Hills Region, Louisiana/Mississippi

Major Contributions of Radiocarbon Dating to Palynology: Past and Future

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