Chemicals and Chemistry
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Reports from National Autonomous University advance knowledge in climate change
June 4th, 2010
"Multiproxy analysis (pollen, diatom, charcoal) on a 6 m core from Lago Verde (Sierra de Los Tuxtlas), shows evidences of environmental changes and human impact on the evergreen rainforest on the tropical lowlands of eastern Mexico during the last ca. 2,800 years. Prehistoric human occupation is recorded since the late Formative throughout the middle Classic (250 b.c.-ca. a.d. 800) by the presence of maize pollen, a low abundance of tropical arboreal taxa and a high abundance of herbaceous pollen and charcoal particles," investigators in Mexico report.
"This occurred under a scenario of very low lake levels from which dry conditions are inferred based on the dominance of...
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Source: Chemicals and Chemistry (2010-06-04)