leg site hole age mnemonic auxiliary age mnemonic top of section depth(m) bottom of section depth(m) special condition age auxiliary age averaged age age top of section(million years) age bottom of section(million years) average age(million years)t data source 21 209 PLEISTOCENE 0.0 18.0 NO AGE GIVEN NO AGE GIVEN 0.011 1.8 .9055 DSDP INITIAL REPORTS 21 209 UPPER PLIOCENE 18.0 36.0 NO AGE GIVEN NO AGE GIVEN 1.8 3.4 2.6 DSDP INITIAL REPORTS 21 209 MIDDLE PLIOCENE 36.0 45.0 NO AGE GIVEN NO AGE GIVEN 3 4 3.5 DSDP INITIAL REPORTS 21 209 MIDDLE MIOCENE 45.0 54.0 NO AGE GIVEN NO AGE GIVEN 10.5 16 13.25 DSDP INITIAL REPORTS 21 209 LOWER MIOCENE 83.0 110.0 NO AGE GIVEN NO AGE GIVEN 16 22.5 19.25 DSDP INITIAL REPORTS 21 209 UPPER OLIGOCENE 110.0 140.0 NO AGE GIVEN NO AGE GIVEN 22.5 30 26.25 DSDP INITIAL REPORTS 21 209 UPPER EOCENE 150.0 281.0 NO AGE GIVEN NO AGE GIVEN 37.5 43 40.25 DSDP INITIAL REPORTS 21 209 MIDDLE EOCENE 281.0 344.0 NO AGE GIVEN NO AGE GIVEN 43 49 46 DSDP INITIAL REPORTS