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The Holocene
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Proglacial lacustrine sediments from El Altar, Ecuador: evidence for late-Holocene climatic change

Gunhild Rosqvist

Department of Physical Geography, Stockholm University, 10691 Stockholm, Sweden

Late-Holocene glacier variations on El Altar, Ecuador, have been reconstructed from proglacial lacustrine sediments. Variations in bulk density and organic content in sediment cores from Laguna Verde, are interpreted as representing a record of the Neoglacial activity of the Obsipo Glacier. Two sedimentological units of laminated silt and clay represent two late-Holocene episodes of glacier expansion, which probably occurred during the last millennium and tentatively suggest a double 'Little Ice Age' signal. Reconstructed equilibrium-line altitudes on the Obispo Glacier seem to reflect changes in both precipitation and temperature, and the glacial fluctuations documented on El Altar are consistent with other evidence of environmental change from northern South America.

Key Words: Climatic change • glacier variations • lake sediments • 'Little Ice Age' • Ecuador • South America.

The Holocene, Vol. 5, No. 1, 111-117 (1995)
DOI: 10.1177/095968369500500112
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