Stratigraphy, Non-Marine Mollusks, and Radiometric Dates from Quaternary Deposits in the Kotzebue Sound Area, Western Alaska

McCulloch, David S.; Taylor, D. W.; Rubin, Meyer

doi:10.1086/627076

Cited by 26 publications

(11 citation statements)

References 9 publications

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“…The boreal forest at 7 ka BP was an unbroken biome extending from Alaska to Newfoundland and Labrador. Latitudinal treeline fell somewhat short of its present position across most of Alaska, although forest tundra extended beyond the present limit of trees on Seward Peninsula, where beavers had been present since at least 9.4 ka (McCulloch et al, 1965). Similarly, the boreal forest still extended beyond its present limit in the Mackenzie Delta region.…”

Section: Ka Bpmentioning

confidence: 86%

Late Quaternary Vegetation History of Northern North America Based on Pollen, Macrofossil, and Faunal Remains*

Dyke

2007

gpq

113

118

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AbstractBiome maps spanning the interval from the last glacial maximum to modern times are presented. The biome distributions at 18 ka BP were probably as nearly in equilibrium with climate as are the modern distributions, but deglacial biomes were probably in disequilibrium. Ice sheet configuration was a strong control of climate until 7 ka BP. Regional climate trends can be inferred from changing biome distributions, but during periods of disequilibrium, biome distributions under-represent summer warming. Because of summer cooling by 2-4 °C during the Holocene, largely in the last 3-5 ka, middle and certain early Holocene biome distributions and species compositions are reasonable analogues of future equilibrium displacements due to equivalent warming, at least in areas that were long-since deglaciated. Past biome migration rates in response to rapid regional warming during deglaciation were mainly in the range of 100-200 m per year. If these rates pertain in the future, biomes may shift 10-20 km in most regions over the next century. A major impediment to using former Holocene conditions as a guide to future conditions is that warmer Holocene summers were accompanied by colder winters, whereas warmer future summers will be accompanied by warmer winters.

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Section: Ka Bpmentioning

confidence: 86%

Late Quaternary Vegetation History of Northern North America Based on Pollen, Macrofossil, and Faunal Remains*

Dyke

2007

gpq

113

118

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“…When P-PE is less than zero, boreal forest is Viereck and Little, 1972, as redrawn by Brubaker, 1985, andNational Atlas Information Service andPetawawa National Forestry Institute, 1993), and locations of probable and possible last interglacial sites with boreal forest indicators (either pollen or macrofossils) in Alaska and adjacent Yukon. Localities plotted and sources of data: (SL) St. Lawrence Island (Colinvaux, 1967;Maeda, 1985); (B) Baldwin Peninsula (McCulloch et al, 1965;Hamilton and Brigham-Grette, 1991;Brigham-Grette and Hopkins, 1995); (NM) Nome (Brigham-Grette and Hopkins, 1995); (D) Deering (Brigham-Grette and Hopkins, 1995); (CP) Cowpack River (Brigham-Grette and Hopkins, 1995); (MH) Mount Harper (Weber and Ager, 1984); (R) Riverside Blu! (Fernald, 1965); (N) Nuyakuk (Elias and Short, 1992); (CB) Ch'ijees Blu!…”

Section: Inferences Based On Pollen and Macrofossil Studiesmentioning

confidence: 99%

Vegetation and paleoclimate of the last interglacial period, central Alaska

Muhs

Ager

Begét

2001

Quaternary Science Reviews

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Follow this and additional works at: https://digitalcommons.unl.edu/usgsstaffpub Part of the Earth Sciences CommonsThis Article is brought to you for free and open access by the US Geological Survey at DigitalCommons@University of Nebraska -Lincoln. It has been accepted for inclusion in USGS Staff --Published Research by an authorized administrator of DigitalCommons@University of Nebraska -Lincoln.Muhs, Daniel R.; Ager, Thomas A.; and Begét, James E., "Vegetation and paleoclimate of the last interglacial period, central Alaska" (2001 AbstractThe last interglacial period is thought to be the last time global climate was signi"cantly warmer than present. New stratigraphic studies at Eva Creek, near Fairbanks, Alaska indicate a complex last interglacial record wherein periods of loess deposition alternated with periods of soil formation. The Eva Forest Bed appears to have formed about the time of or after deposition of the Old Crow tephra (dated to &160 to &120 ka), and is therefore correlated with the last interglacial period. Pollen, macrofossils, and soils from the Eva Forest Bed indicate that boreal forest was the dominant vegetation and precipitation may have been greater than present around Fairbanks during the peak of the last interglacial period. A new compilation of last interglacial localities indicates that boreal forest was extensive over interior Alaska and Yukon Territory. Boreal forest also extended beyond its present range onto the Seward and Baldwin Peninsulas, and probably migrated to higher elevations, now occupied by tundra, in the interior. Comparison of last interglacial pollen and macrofossil data with atmospheric general circulation model results shows both agreement and disagreement. Model results of warmer-than-present summers are in agreement with fossil data. However, numerous localities with boreal forest records are in con#ict with model reconstructions of an extensive cool steppe in interior Alaska and much of Yukon Territory during the last interglacial.

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“…not been recorded previously from Beringian deposits as old as the Sangamon interglacial (see McCulloch et al 1965 andClarke 1973). They are: Amnicola limosa, Succinea strigata (Fig.…”

Section: Additional Resultsmentioning

confidence: 77%

“…The specimens were derived from Pleistocene deposits in the central part of the Old Crow Basin, Yukon Territory. This material, which has been identified by the first author, is of great interest because: (a) it comes from the Beringian Refugium, a poorly known but zoogeographically important region where many Arctic animals and plants survived, and in some cases, evolved during Pleistocene glaciations (McCulloch et al 1965;Clarke 1973;Harington 1977;Bodaly and Lindsey 1977); and (b) it contains two Asiatic species (one being a new subspecies) not previously recorded from North America. Interesting questions arise about the failure of these to become established in North America.…”

Section: Introductionmentioning

confidence: 99%

Asian freshwater mollusks from Pleistocene deposits in the Old Crow Basin, Yukon Territory

Clarke¹,

Harington²

1978

Can. J. Earth Sci.

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Approximately 15 species of terrestrial and freshwater mollusks are reported from Pleistocene deposits in the unglaciated Old Crow Basin of the northern Yukon Territory. Of those species, Bulimus leachi (Sheppard), a widespread Eurasian species; and Valvata piligera yukonensis (n. ssp.), closely related to an unusual Valvata now confined to Lake Baikal, U.S.S.R., are recorded from North America for the first time. Possible causes for the failure of these species of freshwater mollusks to become established in North America are considered.

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Stratigraphy, Non-Marine Mollusks, and Radiometric Dates from Quaternary Deposits in the Kotzebue Sound Area, Western Alaska

Cited by 26 publications

References 9 publications

Late Quaternary Vegetation History of Northern North America Based on Pollen, Macrofossil, and Faunal Remains*

Late Quaternary Vegetation History of Northern North America Based on Pollen, Macrofossil, and Faunal Remains*

Vegetation and paleoclimate of the last interglacial period, central Alaska

Asian freshwater mollusks from Pleistocene deposits in the Old Crow Basin, Yukon Territory

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