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
90	591	B	UPPER MIOCENE		270.6	349.3		NO AGE GIVEN		NO AGE GIVEN	    5	 10.5	 7.75	DSDP INITIAL REPORTS
90	591	B	MIDDLE MIOCENE		349.3	471.6		NO AGE GIVEN		NO AGE GIVEN	 10.5	   16	13.25	DSDP INITIAL REPORTS
90	591	B	LOWER MIOCENE		471.6	500.4		NO AGE GIVEN		NO AGE GIVEN	   16	 22.5	19.25	DSDP INITIAL REPORTS