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 36 328 B PLIOCENE UPPER MIOCENE 7.5 17.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 1.8 10.5 6.15 DSDP INITIAL REPORTS 36 328 B UPPER MIOCENE 17.0 19.8 NO AGE GIVEN NO AGE GIVEN 5 10.5 7.75 DSDP INITIAL REPORTS 36 328 B MIDDLE MIOCENE 19.8 26.5 NO AGE GIVEN NO AGE GIVEN 10.5 16 13.25 DSDP INITIAL REPORTS 36 328 B UPPER OLIGOCENE 26.5 36.0 NO AGE GIVEN NO AGE GIVEN 22.5 30 26.25 DSDP INITIAL REPORTS 36 328 B LOWER OLIGOCENE 36.0 45.5 NO AGE GIVEN NO AGE GIVEN 30 37.5 33.75 DSDP INITIAL REPORTS 36 328 B UPPER EOCENE 45.5 55.0 NO AGE GIVEN NO AGE GIVEN 37.5 43 40.25 DSDP INITIAL REPORTS 36 328 B EOCENE 55.0 64.5 NO AGE GIVEN NO AGE GIVEN 37.5 53.5 45.5 DSDP INITIAL REPORTS 36 328 B SENONIAN UPPER TURONIAN 435.0 444.5 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 65 88 76.5 DSDP INITIAL REPORTS