Poster Number 108
See more from this Division: General Discipline Sessions
See more from this Session: Quaternary Geology (Posters)
Abstract:
Characteristic trends occur within the terrace deposits including sediment composition, color, organic carbon and geochemistry. All terraces have fining upward cycles comprised of medium to coarse silt and each is capped by a 30-50 cm thick paleosol horizon. Some thin layers of coarse sand and granules also are found within Terrace 2 and 3. Color variation in each terrace ranges from light yellowish brown (2.5 YR 6/3) near the base to strong brown (7YR 4/4) at the top. Carbon content is <1% in all terraces with most values < 0.6 wt-%. C:N ratios indicate that organic material contribution came primarily from soil algae with terrestrial contribution most pronounced within the lowest 80 cm of T1 and T4. Trends in major and trace elements show depletion above the boundaries of T3 and T2, and near the upper boundary between T2 and T1. The ages of the terraces imply that several larger than Holocene wet-phases occurred during the Late Quaternary which led to the deposition of these deposits.
See more from this Division: General Discipline Sessions
See more from this Session: Quaternary Geology (Posters)