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(Article of periodic en Anglais - 1983)

Document title

Late Pleistocene vegetation of Kings Canyon, Sierra-Nevada, California

Authors(s) and Affiliation(s)

COLE K. ;

Abstract

Macrofossils from six late Pleistocene packrat midden samples record a mixed coniferous forest dominated by the xerophytic conifers Juniperus occidentalis, Pinus cf. ponderosa, and P. monophylla. The pollen spectra of these Pleistocene middens are dominated by Pinus sp., TaxodiaceaeCupressaceaeTaxaceae (TCT), and Artemisia sp. Mesophytic conifers are represented by low macrofossil concentrations. Sequoiadendron giganteum is represented by a few pollen grains in the full glacial. Edaphic control and snow dispersal are the most likely causes of these mixed assemblages. The dominant macrofossils record a more xeric plant community than those that now occur on similar substrates at higher elevations or latitudes in the Sierra Nevada. These assemblages suggest that late Wisconsin climates were cold with mean annual precipitation not necessarily greather than modern values. This conclusion supports a model of low summer ablation allowing for the persistence of the glaciers at higher elevations during the late Wisconsin.

Source

Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1983, vol. 19, no1 [pp. 117-129]

Bibliographic references : 28 réf.

Language

Anglais

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