The outer part of Laptev and Kara seas shelf is characterized by low rates of Holocene sedimentation in the middle-late Holocene and high rates in the early. Early Holocene conditions were favorable for the development of benthos and plankton, shells of marine mollusks are often found in the layers of this age, benthic and planktonic foraminifera are numerous, which may be due to the influence of warm Atlantic waters.