Holocene Paleofloods of the Ross River, Central Australia

摘要: Abstract The rivers of central Australia rise in the MacDonnell Ranges and flow out across broad, low-relief plains into surrounding desert. stratigraphy Ross River plain records areal extent frequency Holocene floods. This floodout is underlain by deeply weathered alluvial deposits, characterized red earth soils dated thermoluminesence at >59,000 yr. old alluvium covered a sheet-like deposit very silty sand probable eolian origin 9200 ± 900 oldest occurs as bars levee deposits flanking modem channel long-wavelength bedforms that fan plain. resulted from flood flow, up to 10 km wide, entire Evidence for several large floods between 1500 700 yr B.P. also preserved 500- 1500-m-wide paleochannel. Thus, surface features on are product few rare events. paleohydrologic record additional evidence dynamic nature hydrometerological regime Australia.