Subunit IIA is late early Pliocene to late middle Miocene. It is uniform white nannofossil ooze exhibiting laminations that are light bluish to greenish gray. Subunit IIB is late middle Miocene to early middle Miocene. It is also white nannofossil ooze, but lacks laminations. Subunit IIC is white nannofossil ooze to chalk, with some laminations that are light bluish to greenish gray.
Sedimentation rates are moderate.
Although the contact between the limestone and underlying siltstone is very sharp, the sediment character in the lowermost part of the limestone suggests a continued shallow-water influence. Crystalline quartz, diatoms and glauconite are very abundant in the upper part of the unit but decrease downward, as it becomes more clayey. About 1.5 m below the top of the unit, there is a break between more sandy and harder sediments above and more muddy sediments below. Carbonaceous fragments and bioturbation are ubiquitous. Sedimentation rates are low.