De Long sedimentary basin 

(Cenozoic) 

(Beaufort Sea, Chukchi Sea, and adjacent area, unit Czs)

Basin inferred from the tectonic model for delineation of the structure of the Chukchi Continental 
Borderland. On the north, the inferred basin includes an area where the seafloor is more than 2,500 m deep, 
but bathymetry is a poor guide to its areal extent and tectonic character because much of this inferred basin 
seem to be infilled, or at least masked, by clastic sediment from the Indigirka and Kolyma Rivers. No 
seismic-reflection or gravity data exist to infer the areal extent of the basin or the thickness of sedimentary 
rocks within basin. REFERENCE: Grantz and others, 1992.