Poster Number 210
See more from this Division: Topical Sessions
See more from this Session: Soil Geomorphology and Chronosequences (Posters)
Abstract:
Carbonate coats on the underside of stones increase in thickness with stratigraphic age of fans and moraines, providing a tool for relative age determination and correlation. Ultimately, U/Th dating, generally of the innermost carbonate laminations will be carried out to provide numerical ages for coatings, thereby estimating the ages of landforms. Pinedale and Bull Lake(?) moraines have been identified, and carbonate coats have been sampled and measured, in the drainages of Willow Creek and Cedar Creek. Results from Willow Creek revealed mean thicknesses of 0.57 ± 0.31mm for the possible Pinedale moraine, Cedar Creek revealed mean coat thicknesses for the Pinedale and Bull Lake(?) moraines to be 1.56 ± 0.24 mm and 3.83 ± 1.99 mm respectively. A third moraine was identified at Cedar Creek suggesting a possible intermediate glacial advancement between Pinedale and Bull Lake. Despite geographic proximity, the higher elevation forested site at Willow Creek may account for the thinner Pinedale carbonate coat thicknesses at this site as compared to Cedar Creek.
See more from this Division: Topical Sessions
See more from this Session: Soil Geomorphology and Chronosequences (Posters)