- journal_title：Geology
- Contributor：Alan R. Carroll ; Amalia C. Doebbert ; Amanda L. Booth ; C. Page Chamberlain ; Meredith K. Rhodes-Carson ; M. Elliot Smith ; Clark M. Johnson ; Brian L. Beard
- Publisher：Geological Society of America
- Date：2008-
- Format：text/html
- Language：en
- Identifier：10.1130/G24783A.1
- journal_abbrev：Geology
- issn：0091-7613
- volume：36
- issue：10
- firstpage：791
d="p-1">Sedimentary facies of the Eocene Green River Formation reflect a rapid increase in water supply to Lake Gosiute ca. 49 Ma, marked by a stratigraphic fill-to-spill surface. Deposits below this surface constitute repetitive lacustrine expansion-desiccation cycles, whereas those above consist of continuous profundal lacustrine mudstone, grading upward into volcaniclastic deltaic sandstone. Above the fill-to-spill surface, calcitic mudstone δ18O decreases from ~+26‰ to +20‰ over an interval representing ~100 k.y. We interpret this shift to have resulted from capture of a foreland river (or rivers) that drained higher topography north of Lake Gosiute, most likely in north-central Idaho. Accurate paleoelevation estimates derived from stable isotopic records in intermontane basins thus may require detailed knowledge of regional drainage systems.