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 68 502 B QUATERNARY 0.0 1.8 NO AGE GIVEN NO AGE GIVEN 0 1.8 0.9 INITIAL CORE DESCRIPTIONS 68 502 B PLEISTOCENE 1.8 50.2 NO AGE GIVEN NO AGE GIVEN 0.011 1.8 .9055 DSDP INITIAL REPORTS 68 502 B UPPER PLIOCENE 50.2 78.8 NO AGE GIVEN NO AGE GIVEN 1.8 3.4 2.6 DSDP INITIAL REPORTS 68 502 B LOWER PLIOCENE 78.8 94.2 NO AGE GIVEN NO AGE GIVEN 3.4 5 4.2 DSDP INITIAL REPORTS