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 84 567 PLEISTOCENE MIDDLE MIOCENE 0.0 176.1 NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 0.011 16 8.006 DSDP INITIAL REPORTS 84 567 LOWER PLEISTOCENE 176.1 195.5 A LEGITIMATE AGE INVERSION NO AGE GIVEN NO AGE GIVEN 1.2 1.8 1.5 DSDP INITIAL REPORTS