Description and genesis of buried sand-filled soil wedges near Flagstaff, Arizona

Auteur :
KARLSTROM, E.T.

Description :
Buried, sand-filled soil wedges exposed in stratigraphic sections at 2 sites near Flagstaff, are larger than any observed desiccation cracks or fissures in modern surface soils or sediments but they are smaller than typical periglacial sand wedges or ice-wedge casts formed in continuous permafrost. Their size, spacing, and other characteristics most resemble those of soil wedges formed by seasonal frost craching found near and beyond the southern limit of permafrost in areas where mean annual temperatures are about 0°C. Stratigraphic relations and relative degree of development of associated soils suggest the wedges in Flagstaff are of late Wisconsin age whereas.


Type de document :
Article de périodique

Source :
Physical geography, issn : 0272-3646, 2001, vol. 22, n°. 2, p. 167-186, Collation : Illustration, Références bibliographiques : 61 ref.

Date :
2001

Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis