Near the coast, the alluvial sediments grade into nearshore marine sediments containing fossil marine mollusks and lignitized wood (Fujita and Cook 1990, Kos'ko et al.1990).
Near the coast, the alluvial sediments grade into nearshore marine sediments containing fossil marine mollusks and lignitized wood. Thick permafrost characterized by massive ice wedges has developed in these sediments (Fujita and Cook 1990, Kos'ko et al.1990).