{"title":"Lake-Level Chronology on the Southern Bolivian Altiplano (18°–23°S) During Late-Glacial Time and the Early Holocene","description":null,"version":null,"itemType":"journalArticle","abstractNote":"AbstractStratigraphic analyses of outcrops, shorelines, and diatoms from the southern Bolivian Altiplano (Uyuni-Coipasa basin) reveal two major lacustrine phases during the late-glacial period and the early Holocene, based on a chronology established by radiocarbon and U/Th control. A comparison of14C and230Th/234U ages shows that during times of high lake level, radiocarbon ages are valid. However, during low-water periods,14C ages must be corrected for a reservoir effect. The lacustrine Tauca phase started a little before 16,00014C yr B.P., and the lake level reached its maximum between 13,000 and 12,00014C yr B.P. A dry event (Ticaña) occurred after ca. 12,000 and before 950014C yr B.P. A moderate lacustrine oscillation (Coipasa event) occurred between ca. 9500 and 850014C yr B.P., using a reservoir-corrected conventional14C chronology. Comparisons between the lake-level chronology in the Uyuni-Coipasa basin and data from other southern tropical areas of South America suggest that the lacustrine evolution may reflect large-scale climatic changes.","publicationTitle":"","volume":null,"issue":null,"pages":null,"date":"1999","series":"","seriesTitle":"","seriesText":"","journalAbbreviation":null,"language":null,"DOI":"10.1006/qres.1998.2017","ISSN":null,"shortTitle":"","url":"","archive":"","archiveLocation":"","libraryCatalog":null,"callNumber":"","rights":null,"extra":"","dateAdded":"2026-02-25T14:49:31.193001Z","dateModified":"2026-02-25T14:56:34.750712Z","attachment":null,"id":"23bde1cb-ce89-459e-ad29-96cb5c506708","owner_id":"61bf6ec3-0e84-462c-b0e2-3036131e0196","creators":[{"creatorType":"author","firstName":null,"lastName":"Sylvestre","id":370,"item_id":"23bde1cb-ce89-459e-ad29-96cb5c506708"},{"creatorType":"author","firstName":null,"lastName":"et al.","id":371,"item_id":"23bde1cb-ce89-459e-ad29-96cb5c506708"}],"study_sites":[{"created_at":"2026-02-25T14:49:31.201152Z","updated_at":"2026-02-25T14:49:31.201153Z","confidence_score":1.0,"context":"Imported from marcos-custom-data","extraction_method":"manual","item_id":"23bde1cb-ce89-459e-ad29-96cb5c506708","validation_score":1.0,"source_type":"manual","section":"other","name":null,"is_manual":true,"location_id":"f62cc16c-48e3-448f-8dc4-0decb873e912","id":"7e2e8c9e-362c-4740-8a8c-6572587f7826","location":{"created_at":"2026-02-25T14:49:26.664826Z","updated_at":"2026-02-25T14:49:26.664834Z","latitude":-20.167238177303904,"longitude":-67.57806275414086,"cluster_label":null,"id":"f62cc16c-48e3-448f-8dc4-0decb873e912"},"latitude":-20.167238177303904,"longitude":-67.57806275414086}],"tags":[6,8,12]}