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 4 24 A UPPER PALEOCENE 503.0 511.0 NO AGE GIVEN NO AGE GIVEN 53.5 60 56.75 DSDP INITIAL REPORTS 4 24 A CAMPANIAN 511.0 558.0 NO AGE GIVEN NO AGE GIVEN 70 78 74 DSDP INITIAL REPORTS