Geomorphic conditions of accumulation and re-working of the yedoma series at the Northern Yakutia

Abstract

A scheme of the Pleistocene accumulation plains of the North Yakutia is stated. Three sedimentation areas are distinguished along the main rivers: intermountain and foothills, intracontinental plains, coastal plains. In the cross-section of the valleys the authors distinguish an axial and two marginal zones. The axial zone is characterized with mostly channel and delta sediments, the marginal zones-with so-called «yedoma» series, presented by silt with high ice content; the silts belong to various faces of alluvial, proluvial and slope deposits. The original yedoma appearance is best conserved in the intermountain and foothill areas, where terrasouvals exist. Within intra continental and coastal plains the primary relief has been changed into alas and alas-valley topography.