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 59 449 QUATERNARY 0.0 9.5 NO AGE GIVEN NO AGE GIVEN 0 1.8 0.9 DSDP INITIAL REPORTS 59 449 MIDDLE MIOCENE 28.5 57.0 NO AGE GIVEN NO AGE GIVEN 10.5 16 13.25 DSDP INITIAL REPORTS 59 449 LOWER MIOCENE 85.5 104.5 NO AGE GIVEN NO AGE GIVEN 16 22.5 19.25 DSDP INITIAL REPORTS 59 449 LOWER MIOCENE UPPER OLIGOCENE 104.5 111.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 16 30 23 DSDP INITIAL REPORTS