A glacial chronology for the Fish Creek drainage of Boulder Mountain, Utah, USA

Impacts of climate change on the formation and stability of late Quaternary sand sheets and falling dunes, Black Mesa region, southern Colorado Plateau, USA

“…Betancourt, 1990;Cole, 1990;Thompson et al, 1993). Moraines that record glacial advances near Fish Creek, Utah, are documented at 23.1 ka, 20 ka, 16.8 ka, and 15.2 ka using helium exposure ages (Marchetti et al, 2005). Regional lake (Hevly, 1985;Anderson, 1993;Hasbargen, 1994;Anderson et al, 2000Anderson et al, , 2008Jimenez Moreno et al, 2008), groundwater levels on Black Mesa (Zhu et al, 1998), and in southeastern Arizona (Waters, 1989;Pigati et al, 2009) were at the highest levels in their recorded history (Fig.…”

“…Correlation of OSL age estimates from falling dunes and mesa top sandsheets and dune complexes from Black Mesa (this study) with other paleoenvironmental records from the southwestern United States. Regional glacial, alluvial, and groundwater records: 7) Marchetti et al, 2005;8) Anders et al, 2005;9) Zhu et al, 1998;10) Pigati et al, 2009;11) Waters and Haynes, 2001. Regional lacustrine records: 12) Jim enez- Moreno et al, 2008;13) Anderson et al, 2008;14) Waters, 1989;15) Hevly, 1985;16) Anderson, 1993;17) Weng and Jackson, 1999;18) Hasbargen, 1994. aridity.…”

Gravel-capped benches above northern tributaries of the Escalante River, south-central Utah

“…During the Last Glacial Maximum (LGM; ~21 ± 2 ka, ~MIS [marine isotope stage] 2), Boulder Mountain had an ice cap with outlet glaciers that fl owed radially from the center of the ice mass (Flint and Denny, 1958;Marchetti et al, 2005aMarchetti et al, , 2007. It is still unclear whether or not Boulder Mountain was glaciated during the penultimate glaciation (~MIS 6).…”

“…Flint and Denny (1958) argue that there was a Bull Lakeage (what they meant by "Bull Lake" age is also unclear, likely either ~MIS 4 or ~MIS 6) glaciation around Boulder Mountain. However, Waitt (1997) and Marchetti et al (2005aMarchetti et al ( , 2007 found no evidence of Bull Lake-age glacial deposits and reinterpreted the Bull Lake-age glacial deposits of Flint and Denny (1958) as mass movement deposits. The lowest elevation of defi nitive glacial deposits in the upper reaches of the Escalante drainage basin is between 2600 and 2700 m along both East and West Boulder Creeks (Fig.…”

“…These deposits represent the former active channels of streams that were inundated with mass movements and presently sit high above the modern tributary drainages, demonstrating considerable bedrock incision since deposition. The predominant lithology of these deposits (trachyandesites) is well characterized with respect to cosmogenic 3 He exposure-age dating (Marchetti and Cerling, 2005;Marchetti et al, 2005aMarchetti et al, , 2011. Following on that framework, we also present cosmogenic exposure-age estimates for the largest boulders from each of the four surfaces we investigated.…”