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This study documents the discovery of mound morphologies containing gas hydrate and methane-derived authigenic carbonate (MDAC) in the southwestern slope of the Chukchi Plateau, during the IBRV Araon expeditions in 2016 and 2018. A multibeam bathymetric surveying was the basis for a new and detailed rendering around the mounds. Sub-bottom profiles and site-targeted gravity cores were also collected across these mounds which were located at water depths between 780 m and 580 m. Mounds aredoi:10.18814/epiiugs/2020/020053 fatcat:kvugfspmzzfdvkuxhqon5wycby