By Troy Lewis Péwé
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Additional info for Eva Interglaciation Forest Bed, unglaciated east-central Alaska: global warming 125,000 years ago (GSA Special Paper 319)
Spruce pollen was totally lacking (E. S. Barghoorn, Nov. 23, 1954, written communication). The 1955 material revealed that the peat represented a locally treeless, swampy area some distance removed from alder Eva Interglaciation Forest Bed and birch thickets (Alnus and Betula were conspicuously low). Although ferns are probably locally over-represented, a relatively sparse tree (spruce) cover is reasonable. To compare this paleoenvironment with the nearby modern surface vegetation from the bottom of forested Goldstream Valley (Sec.
All of the statistics were calculated using individual ring measurements. The average maximum measurement is the maximum measurement from each individual tree radius averaged for all radii that make up a chronology. The mean annual measurement, standard deviation, first order autocorrelation, and mean sensitivity were first calculated for each radius and then averaged for the site. The average mean sensitivity of time series x (msx) is calculated as ms x = 1 n −1 t = n −1 ∑ 2( xt +1 − xt ) ( xt +1 + xt ) t =1 where xt and xt + 1 are yearly ring widths and n is the total number of years in the series.
5 mthick peat-bed exposure 10-m long at the base of the Goldstream Formation at the north side of Ester Island (1949; Figs. 2, 22) and from the upper part of the Gold Hill Loess at West Dawson mining cut adjacent to Goldstream Valley (1955; Fig. 3) were examined by E. S. Barghoorn of Yale University. He reported that the 1949 material indicated a treeless tundra environment, colder than today, with abundant growth of Equisetum, grasses, sedges, herbs, and dwarf trees (birch and willow). Spruce pollen was totally lacking (E.
Eva Interglaciation Forest Bed, unglaciated east-central Alaska: global warming 125,000 years ago (GSA Special Paper 319) by Troy Lewis Péwé