Reinterpretation of the Burmester core, Bonneville basin, Utah

Initial interpretation of the sediments from the Burmester core (Eardley et al, (1973), Geological Society of America Bulletin 84, 211-216) indicated that 17 deep-lake cycles, separated by shallow-lake and soil-forming interv als, occurred in the Bonneville basin during the Brunhes Chron (the last 78 0 x 10(3) yr). Our re-examination of the core, along with new sedimentologi cal, geochronological, and paleontological data, indicate that only four de ep-lake cycles occurred during this period, apparently correlative with mar ine oxygen-isotope stages 2, 6, 12, and 16. This interpretation suggests th at large lakes formed in the Bonneville basin only during the most extensiv e of the Northern Hemisphere glaciations. (C) 1999 University Washington.