abyssal sediments
modern and ancient marine sediments (mainly carbonate and siliceous oozes, red clay) accumulated at the depths of 3,000 m and below
en-US/əˈbɪsəl ˈsɛdəmənts/
en-GB/əˈbɪsəl ˈsɛdɪmənts/
modern and ancient marine sediments (mainly carbonate and siliceous oozes, red clay) accumulated at the depths of 3,000 m and below