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 26 255 QUATERNARY 0.0 13.5 NO AGE GIVEN NO AGE GIVEN 0 1.8 0.9 DSDP INITIAL REPORTS 26 255 PLIOCENE 23.0 24.6 NO AGE GIVEN NO AGE GIVEN 1.8 5 3.4 DSDP INITIAL REPORTS 26 255 UPPER MIOCENE 24.6 32.5 NO AGE GIVEN NO AGE GIVEN 5 10.5 7.75 DSDP INITIAL REPORTS 26 255 MIDDLE MIOCENE 32.5 42.0 NO AGE GIVEN NO AGE GIVEN 10.5 16 13.25 DSDP INITIAL REPORTS 26 255 LOWER MIOCENE 42.0 51.5 NO AGE GIVEN NO AGE GIVEN 16 22.5 19.25 DSDP INITIAL REPORTS 26 255 MIOCENE 51.5 61.0 NO AGE GIVEN NO AGE GIVEN 5 22.5 13.75 DSDP INITIAL REPORTS 26 255 MIDDLE EOCENE 61.0 70.5 NO AGE GIVEN NO AGE GIVEN 43 49 46 DSDP INITIAL REPORTS 26 255 UPPER CRETACEOUS 70.5 80.0 NO AGE GIVEN NO AGE GIVEN 65 100 82.5 DSDP INITIAL REPORTS 26 255 SANTONIAN 80.0 108.5 NO AGE GIVEN NO AGE GIVEN 78 82 80 DSDP INITIAL REPORTS