Evidence for differential pollen preservation in late quaternary sediments in Minnesota

Cushing, Edward J.

doi:10.1016/0034-6667(67)90175-3

Cited by 248 publications

(163 citation statements)

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“…Pollen and spore morphological criteria follow, wherever possible, Birks (1973) and Faegri and Iversen (1975). The indeterminable pollen and spores were assigned to one of five categories (Cushing, 1967) -degraded, corroded, broken, crumpled or concealed -depending on why the particular grain was indeterminable. The indeterminable categories, particularly indeterminable: corroded, account for up to 25 % of the total pollen and spores (2P) counted in some samples.…”

Section: Pollen-analytical Methodsmentioning

confidence: 99%

“…In addition, over 70% of all the determinable grains in the sequence are corroded, mainly by exine thinning and perforation (Havinga, 1967). Both experimental (Havinga, 1967(Havinga, , 1971) and observational (Cushing, 1967;Andersen, 1970;Bradshaw, 1978;Hall, 1981) data indicate that under certain sedimentary environments, there is differential destruction of pollen by corrosion. As over 30 % of the pollen in some samples is indeterminable because of corrosion, it is possible that the observed determinable pollen assemblages (Fig.…”

Section: Introductionmentioning

confidence: 95%

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Mid‐flandrian Forest History of Roudsea Wood National Nature Reserve, Cumbria

Birks¹

1982

New Phytologist

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SUMMARYA pollen-stratigraphic record from a small (25 m diameter) hollow situated within the Carboniferous limestone area of Roudsea Wood is presented. The record extends from 6680 to 5150 years B.P. and shows that the canopy of the mid-Flandrian forest around the hollow contained 10 to 30% Quercus, 5 to 15 % Betula, 2 to 15 % Ulmus cf. U. glabra, 5 to 25 % Tilia cordata, 5 to 25 % Fraxinus excelsior, 15 to 20 % Alnusglutinosa, and 10 to 30 % Corylus avellana. Minor trees and shrubs were also present, including Acer campestre, Euonymus europaeus, Rhamnus catharticus, Sorbus torminalis, and Thelycrania sanguinea, all of which grow today at or near their northern British limits near Roudsea Wood.

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Section: Pollen-analytical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Mid‐flandrian Forest History of Roudsea Wood National Nature Reserve, Cumbria

Birks¹

1982

New Phytologist

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“…Counts were based on a maximum of 200 pollen grains and spores per slide. Palynomorph preservation was classified according to Cushing (1967) (Table 2). The samples reveal a relatively well-preserved and diverse pollen and spore assemblage.…”

Section: Palynological Analysesmentioning

confidence: 99%

“…-Within the Tepoztlán Formation five categories of preservation were recognized following Cushing's (1967) hierarchical classification:…”

Section: Lithotypes and Palynomorph Preservationmentioning

confidence: 99%

“…Wellpreserved pollen grains show no obvious signs of damage, fragmented pollen grains have a distinctly ruptured exine in one or more places and crumpled pollen grains are twisted or folded along more than one axis (Cushing, 1967). Corroded pollen grains have exines displaying pitting or local etching (Havinga, 1984), or a more widespread thinning (Havinga, 1964;Holloway, 1989).…”

Section: Lithotypes and Palynomorph Preservationmentioning

confidence: 99%

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