Abstract
Floodplain widening “Spasskoe” includes a portion of the Oka floodplain and its two tributaries, the Istya and Pronya rivers, with a total area of about 120 km 2 . The floodplain in this part of the Oka valley was formed within a depression that was occupied by a lake about 30 thousand years ago and filled with lacustrine-alluvial sands that were preserved within the remnants of the first terrace above the floodplain. Overlaying floodplain alluvial facies with a thickness of 3.5 to 5.5 m occurred intermittently during the colder climate phases since the end of the Atlantic period of the Holocene to the present time. In relatively warm phases, floodplain sedimentation ceased due to the decrease of floods, and soil formation took place. 14 C-dates, which record the stages of surface stabilization in periods from 400 to 3500 years ago were obtained for three buried soils. Formation of different generations of floodplain segments with levee-hollow to leveled topography occurred in the Subboreal and Subatlantic periods of the Holocene.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
