| | USING TILL TEXTURES TO DETERMINE THERMAL ZONES AT THE MARGIN OF EAST ANTARCTIC OUTLET GLACIERS (Site not responding. Last check: 2007-10-10) |
 | | Here, we describe textural changes of Asgard till near its upper-elevation limit in Sessrumnir Valley that are best explained by deposition from polythermal glacier ice, changing from a wet-based inner zone to a frozen-based marginal zone. |
 | | Our observed textural changes, based on analyses of 5,500 clasts from Asgard till in Sessrumnir Valley, along with the mapped distribution of undisturbed ventifacts that cap colluvium beneath Asgard till, show that the thermal transition occurred over a lateral zone about 200 m in width. |
 | | This zone, which is apparent in high-elevation air photographs of Sessrumnir Valley, is concentric about the drift margin and reflects the degree to which underlying colluvial deposits were incorporated into Asgard till. |
| gsa.confex.com /gsa/2001AM/finalprogram/abstract_28644.htm (343 words) |