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 13 127 B PLIOCENE LOWER CRETACEOUS 165.0 166.0 A LEGITIMATE AGE INVERSION NO AGE GIVEN NO AGE GIVEN NO AGE GIVEN 1.8 135 68.4 DSDP INITIAL REPORTS