.Tbans. N.Z. Inst., Vol. LI I. 



Plate XVII. 



iS!:^ 



Fig. 1. — Looking down Birch Hollow, Middle Waipaia. The lower cliff on the left 

 shows the lignitic series, and the upper cliff the yellow sands of the 

 Piripauan below the Ostrea bed. 



Fig. 2. — Grey muddy sandstones with saurian concretions, Waipara River. 



