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 59 448 MIDDLE MIOCENE 0.0 24.0 NO AGE GIVEN NO AGE GIVEN 10.5 16 13.25 DSDP INITIAL REPORTS 59 448 MIDDLE MIOCENE LOWER MIOCENE 24.0 33.5 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 10.5 22.5 16.5 DSDP INITIAL REPORTS 59 448 LOWER MIOCENE 33.5 71.5 NO AGE GIVEN NO AGE GIVEN 16 22.5 19.25 DSDP INITIAL REPORTS 59 448 UPPER OLIGOCENE 81.0 166.5 NO AGE GIVEN NO AGE GIVEN 22.5 30 26.25 DSDP INITIAL REPORTS 59 448 UPPER OLIGOCENE MIDDLE OLIGOCENE 166.5 204.5 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 22.5 32 27.25 DSDP INITIAL REPORTS 59 448 MIDDLE OLIGOCENE 204.5 328.0 NO AGE GIVEN NO AGE GIVEN 29 32 30.5 DSDP INITIAL REPORTS