Figure 12. Whole rock thin section from yellow limestone, Flying Fish Cove, showing association with coralline algae and rare small benthic foraminifera. The largest bioclast is a fragment of Grzybowskia jasoni in oblique section of the gerontic stage showing the radial septa extending into the alar prolongations. The distal end of these septa is outside the alar prologations where the primary chamberlets reach a similar height to form a spiral alignment. More distal to this, the chamberlets are aligned at a high angle, curved backwards and are formed from arched units of irregular shape and size. In this section each instar of growth, with a radial chamberlet and a corresponding row of small chamberlets, can be recognised.

Note that with the highly backwards curved alignment of chamberlets, and associated high rate of whorl size increases, the direction of growth of the test in the gerontic stage tends to become more radial than spiral.

Thin section FFC 1C illustrates the maximum radial dimension of the main specimen; this specimen is 1.54 mm at its widest portion.