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 29 277 UPPER PLEISTOCENE 0.0 3.0 NO AGE GIVEN NO AGE GIVEN 0.01 0.7 0.355 DSDP INITIAL REPORTS 29 277 LOWER PLEISTOCENE 3.0 4.5 NO AGE GIVEN NO AGE GIVEN 1.2 1.8 1.5 DSDP INITIAL REPORTS 29 277 UPPER OLIGOCENE MIDDLE OLIGOCENE 4.5 83.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 22.5 32 27.25 DSDP INITIAL REPORTS 29 277 MIDDLE OLIGOCENE 83.0 136.5 NO AGE GIVEN NO AGE GIVEN 29 32 30.5 DSDP INITIAL REPORTS 29 277 LOWER OLIGOCENE 136.5 187.5 NO AGE GIVEN NO AGE GIVEN 30 37.5 33.75 DSDP INITIAL REPORTS 29 277 UPPER EOCENE 187.5 254.0 NO AGE GIVEN NO AGE GIVEN 37.5 43 40.25 DSDP INITIAL REPORTS 29 277 MIDDLE EOCENE 254.0 387.0 NO AGE GIVEN NO AGE GIVEN 43 49 46 DSDP INITIAL REPORTS 29 277 MIDDLE EOCENE LOWER EOCENE 387.0 415.5 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 43 53.5 48.25 DSDP INITIAL REPORTS 29 277 LOWER EOCENE 415.5 444.0 NO AGE GIVEN NO AGE GIVEN 49 53.5 51.25 DSDP INITIAL REPORTS 29 277 UPPER PALEOCENE 444.0 463.0 NO AGE GIVEN NO AGE GIVEN 53.5 60 56.75 DSDP INITIAL REPORTS 29 277 MIDDLE PALEOCENE 463.0 472.5 NO AGE GIVEN NO AGE GIVEN 58 60 59 DSDP INITIAL REPORTS