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Long sediment cores from 2 lakes in Yunnan Province were used to infer the paleoclimate of southwest China over the past 50,000 yr. Magnetic, sedimentologic, and geochemical analyses on these sediment cores were conducted.

Bolivia ; C 14 dating ; Climatic variation ; Core sampling ; Geochemistry ; Geochronology ; Holocene ; Lacustrine sedimentation ; Lake ; Lake level ; Lithology ; Peru ; Quaternary ; South America ; Watershed
Sediment cores collected from the southern basin of Lake Titicaca, on a transect from 4.6 m above overflow level to 15.1 m below overflow level are used to identify a new century-scale chronology of Holocene lake-level variations. The results
indicate that lithologic and geochemical analyses on a transect of cores can be used to identify and date century-scale lake-level changes. Detailed sedimentary analyses of subfacies and radiocarbon dating were conducted on 4 representative cores. Several

. 1100) coincided with periods of abrupt, profound climate change. The timing and magnitude of climate changes are inferred from stratigraphic evidence of lake-level variation recorded in 14C-dated lake-sediments cores. A prolonged drier period (ca. A.D

The AA. report palynological and geochemical results from the Lake Miragoane core, Haiti, and present them in light of climate inferences based on δ O-18 data. Holocene vegetation trends are compared with records from continental sites surrounding

A 4000-yr sediment core record from Lake Salpetén, Guatemala, provides evidence for Maya-induced forest clearance and consequent soil erosion between 1700 cal yr B.C. and 850 cal yr A.D. Radiocarbon ages of wood, seeds, and charcoal support an age

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