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 60 458 HOLOCENE UPPER PLEISTOCENE 0.0 9.5 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 0 0.7 0.35 DSDP INITIAL REPORTS 60 458 LOWER PLEISTOCENE 9.5 19.0 NO AGE GIVEN NO AGE GIVEN 1.2 1.8 1.5 DSDP INITIAL REPORTS 60 458 UPPER PLIOCENE 19.0 38.0 NO AGE GIVEN NO AGE GIVEN 1.8 3.4 2.6 DSDP INITIAL REPORTS 60 458 UPPER MIOCENE 38.0 57.0 NO AGE GIVEN NO AGE GIVEN 5 10.5 7.75 DSDP INITIAL REPORTS 60 458 MIDDLE MIOCENE 57.0 104.5 NO AGE GIVEN NO AGE GIVEN 10.5 16 13.25 DSDP INITIAL REPORTS 60 458 LOWER MIOCENE 104.5 161.5 NO AGE GIVEN NO AGE GIVEN 16 22.5 19.25 DSDP INITIAL REPORTS 60 458 LOWER MIOCENE UPPER OLIGOCENE 171.0 180.5 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 16 30 23 DSDP INITIAL REPORTS 60 458 UPPER OLIGOCENE 190.0 228.0 NO AGE GIVEN NO AGE GIVEN 22.5 30 26.25 DSDP INITIAL REPORTS 60 458 LOWER OLIGOCENE 228.0 256.5 NO AGE GIVEN NO AGE GIVEN 30 37.5 33.75 DSDP INITIAL REPORTS