Author: Richard E. Church
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 102
Get Book Here
Book Description
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).
Author: Troy Lewis Péwé
Publisher: Geological Society of America
ISBN: 0813721032
Category : Patterned Ground Alaska Donnelly Dome Region
Languages : en
Pages : 98
Get Book Here
Book Description
Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 386
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 462
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 1306
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Irrigation
Languages : en
Pages : 220
Get Book Here
Book Description
Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 478
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 230
Get Book Here
Book Description
Author: W. Brent Garry
Publisher: Geological Society of America
ISBN: 081372483X
Category : Science
Languages : en
Pages : 582
Get Book Here
Book Description
Where on Earth is it like Mars? How were the Apollo astronauts trained to be geologists on the Moon? Are volcanoes on Earth just like the ones on other planets? The exploration of our solar system begins in our own backyard. Discoveries on other planetary bodies cannot always be easily explained. Therefore, geologic sites on this planet are used to better understand the extraterrestrial worlds we explore with humans, robots, and satellites. Analogs for Planetary Exploration is a compilation of historical accounts of astronaut geology training, overviews of planetary geology research on Mars, educational field trips to analog sites, plus concepts for future human missions to the Moon. This Special Paper provides a great overview of the science, training, and planning related to planetary exploration for students, educators, researchers, and geology enthusiasts. After all, as we learn about the solar system we can better understand our own planet Earth.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 224
Get Book Here
Book Description
