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 82 559 UPPER PLIOCENE 0.0 0.9 NO AGE GIVEN NO AGE GIVEN 1.8 3.4 2.6 DSDP INITIAL REPORTS 82 559 LOWER PLIOCENE 0.9 1.7 NO AGE GIVEN NO AGE GIVEN 3.4 5 4.2 DSDP INITIAL REPORTS 82 559 UPPER MIOCENE 1.7 2.1 NO AGE GIVEN NO AGE GIVEN 5 10.5 7.75 DSDP INITIAL REPORTS 82 559 MIDDLE MIOCENE 2.1 238.0 NO AGE GIVEN NO AGE GIVEN 10.5 16 13.25 DSDP INITIAL REPORTS