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 80 548 QUATERNARY 0.0 100.0 NO AGE GIVEN NO AGE GIVEN 0 1.8 0.9 DSDP INITIAL REPORTS 80 548 UPPER PLIOCENE 100.0 133.0 NO AGE GIVEN NO AGE GIVEN 1.8 3.4 2.6 DSDP INITIAL REPORTS 80 548 LOWER PLIOCENE 133.0 211.0 NO AGE GIVEN NO AGE GIVEN 3.4 5 4.2 DSDP INITIAL REPORTS