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 5 41 NEOGENE 0.0 6.0 NO AGE GIVEN NO AGE GIVEN 1.8 22.5 12.15 DSDP INITIAL REPORTS 5 41 UPPER EOCENE 6.0 21.5 NO AGE GIVEN NO AGE GIVEN 37.5 43 40.25 DSDP INITIAL REPORTS 5 41 MIDDLE EOCENE 21.5 34.0 NO AGE GIVEN NO AGE GIVEN 43 49 46 DSDP INITIAL REPORTS