Proceedings Volume of the Geological Society of America for 1955
Author : Geological Society of America. Meeting
Publisher :
Page : 246 pages
File Size : 17,10 MB
Release : 1956
Category : Geology
ISBN :
Author : Geological Society of America. Meeting
Publisher :
Page : 246 pages
File Size : 17,10 MB
Release : 1956
Category : Geology
ISBN :
Author : Geological Society of America
Publisher :
Page : 254 pages
File Size : 38,3 MB
Release : 1962
Category : Geology
ISBN :
List of members.
Author : Geological Society of America
Publisher :
Page : 930 pages
File Size : 39,53 MB
Release : 1958
Category : Geology
ISBN :
List of members.
Author : Geological Society of America
Publisher :
Page : 260 pages
File Size : 21,57 MB
Release : 1962
Category : Geology
ISBN :
Author : Geological Society of America
Publisher :
Page : 1176 pages
File Size : 43,82 MB
Release : 1958
Category : Geology
ISBN :
List of members.
Author : Geological Society of America
Publisher :
Page : 534 pages
File Size : 43,58 MB
Release : 1959
Category : Geology
ISBN :
Author :
Publisher :
Page : 888 pages
File Size : 10,59 MB
Release : 1950
Category : Coast changes
ISBN :
Author : Edwin Butt Eckel
Publisher : Geological Society of America
Page : 184 pages
File Size : 42,24 MB
Release : 1982
Category : Science
ISBN : 081371155X
Author :
Publisher :
Page : 462 pages
File Size : 23,31 MB
Release : 1964
Category : Frozen ground
ISBN :
Author : Richard E. Church
Publisher :
Page : 102 pages
File Size : 39,95 MB
Release : 1965
Category : Frozen ground
ISBN :
Large-scale patterned ground in the Donnelly Dome area of central Alaska consists of polygons 25 to 46 m in diameter bounded by shallow troughs 1 to 2 m wide that form the sides of the polygons. The troughs are underlain by wedge-shaped masses of sediments that extend downward 2 to 3 m. Texture of the sediments of the wedges is distinct from that of the poorly stratified glacial outwash gravel that the wedges transect. Sediments of the wedge vary texturally along the strike and vertically within a given wedge. The coarsest material in the wedge is about 75 mm in diameter, which is the same size as the coarsest material in the outwash. The fine material in the wedges is silt, the same as that which blankets the area. The patterned ground of the Donnelly Dome area originated during Wisconsin time when the mean annual air temperature was at least 3C colder than now. Wigh the warming of the climate in post-Wisconsin time most of the perennially frozen gravel thawed and the ice wedges melted. The voids created by the melting of the ice wedges were filled with sediment that was washed from the surface or collapsed from the thawed sides of the voids. The troughs bounding the polygons are now, however, no longer underlain with ice wedges but with ice wedge pseudomorphs (fossil ice wedges). (Author).