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 1 5 PLIOCENE OLIGOCENE 0.0 3.7 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 1.8 37.5 19.65 DSDP INITIAL REPORTS 1 5 SANTONIAN TURONIAN 31.1 71.7 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 78 92 85 DSDP INITIAL REPORTS