The Interglacial Flora of Worth Point, western Banks Island

Kuc, Marian

doi:10.4095/104761

Cited by 12 publications

(14 citation statements)

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Section: Quaternary Events Prior To Banks Glaciationmentioning

confidence: 99%

“…Four radiocarbon determinations on wood or peat gave ages of >35 000 (l-GSC-19;CRAIG and FYLES, 1960, p. 4), > 43 000 (GSC-1293;KUC, 1974), >52 000 (GSC-2072; Kuc, unpubl. ) and >54 600 (GSC-1236;KUC, 1974). It is impossible at this time to say whether these deposits are entirely preglacial or whether they accumulated during an early Quaternary Interglaciation.…”

Section: Quaternary Events Prior To Banks Glaciationmentioning

confidence: 99%

“…Nonglacial sediments underlie the Bernard Till in both the Duck Hawk Bluffs and Worth Point Bluffs ( KUC (1974) who concluded that the peat accumulated during an "Interglaciation", in an open, Subarctic forest-tundra environment similar to that of the northern part of the boreal forest today. Four radiocarbon determinations on wood or peat gave ages of >35 000 (l-GSC-19;CRAIG and FYLES, 1960, p. 4), > 43 000 (GSC-1293;KUC, 1974), >52 000 (GSC-2072; Kuc, unpubl.…”

Section: Quaternary Events Prior To Banks Glaciationmentioning

confidence: 99%

“…Fyles also investigated numerous sections, such as the Worth Point Bluffs and Duck Hawk Bluffs, and showed that sediments, possibly interglacial in nature, existed on Banks Island (CRAIG and FYLES, 1965). KUC (1974) described the peats in the Worth Point Bluffs and concluded that they accumulated in an open subarctic forest tundra environment during an interglaciation.…”

Section: Introductionmentioning

confidence: 99%

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The Quaternary History of Banks Island, N.W.T., Canada

Vincent¹

2007

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Banks Island is a polar desert where continental ice sheets, spreading from a dispersal centre to the southeast, reached their maximum extent on at least three occasions. The oldest Banks Glaciation affected all but the northwest. The Pre-Banks Sea preceded glacierization while the Post-Banks Sea formed during déglaciation. Following Morgan Bluffs Interglaciation, characterized by a climate similar to that of today, the south, the east, and the Thomsen River basin were covered during Thomsen Glaciation. The Pre-Thomsen Sea preceded the glacierization, while the Big Sea inundated much of the Island during déglaciation. Following the last or Cape Collinson Interglaciation, characterized by a climate warmer than that of the hypsithermal, Laurentide glacial lobes impinged on the coastal areas, during the M'Clure Stade of Amundsen Glaciation. Prince of Wales and Thesiger lobes, emanating from Amundsen Gulf, respectively advanced in Prince of Wales Strait and Thesiger Bay impinging on the east and southwest coasts. At the same time, Prince Alfred Lobe, originating in Viscount Melville Sound, advanced in M'Clure Strait and impinged on the north coast. The Pre-Amundsen Sea preceded the glacierization of the south coast, while the East Coast Sea submerged the east coast up to 120 m, the Meek Point Sea the west up to 20 m and the Investigator Sea the north up to 30 m, during déglaciation. The late Sand Hills Readvance of Thesiger Lobe built a morainic system on the southwest coast. Later, the northeast was covered, during the Russell Stade of Amundsen Glaciation, by Viscount Melville Lobe, emanating from Viscount Melville Sound, and the east coast was drowned up to 25 m by the Schuyter Point Sea. Limits of extent of Laurentide ice in the southwestern Archipelago are proposed for the two stades of the last or Wisconsinan Glaciation.

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Section: Quaternary Events Prior To Banks Glaciationmentioning

confidence: 99%

Section: Quaternary Events Prior To Banks Glaciationmentioning

confidence: 99%

Section: Quaternary Events Prior To Banks Glaciationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Quaternary History of Banks Island, N.W.T., Canada

Vincent¹

2007

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“…Alnus crispa is principally a boreal species, and occurs just north of the limit for Picea along the forest-tundra ecotone of the Northwest Territories (Fig. 1B), whereas it occurs quite far north of these trees on the LabradorUngava Peninsula (ELLIOTT, 1979), even extending to Greenland (KUC, 1974).…”

Section: Alnusmentioning

confidence: 99%

Isopoll Maps and an Analysis of the Distribution of the Modern Pollen Rain, Eastern and Central Northern Canada

Elliot-Fisk¹,

Andrews²,

Short³

et al. 2007

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At 39 sites in eastern and central northern Canada, multiple samples of surface moss and lichens have been analyzed for their pollen content. Although pollen from 20 to 30 taxa were identified in the samples from each site, 8 pollen types (Alnus, Betula, Picea. Pinus, Salix, Gramineae, Cyperaceae and Ericaceae) usually comprise 90 to 100% of the pollen rain. We present isopoll maps of these taxa based on mean percentages of multiple samples from the 39 sites. The data are further analyzed by a number of statistical methods to determine whether there are specific pollen assemblages within this region and to what extent present day climatic parameters and floristic/vegetation zones correlate with pollen counts. Cluster analysis on raw data and on principal component scores yields six distinct pollen assemblages which are further examined by discriminant analysis. Pollen concentration maps for eastern Canada are also presented here and used as an aid in interpreting the percentage data.

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Cynodontium luthii sp. nov.: a permineralized moss gametophyte from the Late Cretaceous of the North Slope of Alaska

Bippus

Rothwell

Stockey

2021

American J of Botany

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PREMISE Mosses are a major component of Arctic vegetation today, with >500 species known to date. However, the origins of the Arctic moss flora are poorly documented in the fossil record, especially prior to the Pliocene. Here, we present the first anatomically preserved pre‐Cenozoic Arctic moss and discuss how the unique biology of bryophytes has facilitated their success in polar environments over geologic time. METHODS A permineralized fossil moss gametophyte within a block of Late Cretaceous terrestrial limestone, collected along the Colville River on the North Slope of Alaska, was studied in serial sections prepared using the cellulose acetate peel technique. RESULTS The moss gametophyte is branched and has leaves with a broad base, narrow blade, and excurrent costa. We describe this fossil as Cynodontium luthii sp. nov., an extinct species of a genus that is known from the High Arctic today. Cynodontium luthii is the oldest evidence of the family Rhabdoweisiaceae (by ≥18 Ma) and reveals that genera of haplolepideous mosses known in the extant Arctic flora also lived in high‐latitude temperate deciduous forests during the Late Cretaceous. CONCLUSIONS The occurrence of C. luthii in Cretaceous sediments, together with a rich Pliocene‐to‐Holocene fossil record of extant moss genera in the High Arctic, suggests that some moss lineages have exploited their poikilohydric, cold‐ and desiccation‐tolerant physiology to live in the region when it experienced both temperate and freezing climates.

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The Interglacial Flora of Worth Point, western Banks Island

Cited by 12 publications

References 0 publications

The Quaternary History of Banks Island, N.W.T., Canada

The Quaternary History of Banks Island, N.W.T., Canada

Isopoll Maps and an Analysis of the Distribution of the Modern Pollen Rain, Eastern and Central Northern Canada

Cynodontium luthii sp. nov.: a permineralized moss gametophyte from the Late Cretaceous of the North Slope of Alaska

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