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 85 574 C LOWER MIOCENE 194.5 346.5 NO AGE GIVEN NO AGE GIVEN 16 22.5 19.25 DSDP INITIAL REPORTS 85 574 C LOWER MIOCENE UPPER OLIGOCENE 346.5 356.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 16 30 23 DSDP INITIAL REPORTS 85 574 C UPPER OLIGOCENE 356.0 441.5 NO AGE GIVEN NO AGE GIVEN 22.5 30 26.25 DSDP INITIAL REPORTS 85 574 C UPPER OLIGOCENE LOWER OLIGOCENE 441.5 451.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 22.5 37.5 30 DSDP INITIAL REPORTS 85 574 C LOWER OLIGOCENE 451.0 508.0 NO AGE GIVEN NO AGE GIVEN 30 37.5 33.75 DSDP INITIAL REPORTS 85 574 C UPPER EOCENE 508.0 520.0 NO AGE GIVEN NO AGE GIVEN 37.5 43 40.25 DSDP INITIAL REPORTS