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 14 136 LOWER PLIOCENE 130.0 139.0 NO AGE GIVEN NO AGE GIVEN 3.4 5 4.2 DSDP INITIAL REPORTS 14 136 UPPER MIOCENE MIDDLE MIOCENE 216.0 225.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 5 16 10.5 DSDP INITIAL REPORTS 14 136 LOWER MIOCENE 235.0 244.0 NO AGE GIVEN NO AGE GIVEN 16 22.5 19.25 DSDP INITIAL REPORTS 14 136 LOWER MIOCENE UPPER OLIGOCENE 244.0 253.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 16 30 23 DSDP INITIAL REPORTS 14 136 SANTONIAN CONIACIAN 253.0 271.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 78 86 82 DSDP INITIAL REPORTS 14 136 SANTONIAN TURONIAN 271.0 280.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 78 92 85 DSDP INITIAL REPORTS 14 136 CENOMANIAN APTIAN 280.0 289.0 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 92 110 101 DSDP INITIAL REPORTS