The Sandstones. 
105 
discover abundant instances of this false bedding or 
cross-stratification . Immediately und er a bed rendered 
worthless by this structure, we often find a bed up to 
forty feet in thickness of magnificent freestone sliow- 
Fig. 28. — (1) PristisomuB latm, 1 lateral aspect, wanting tail. 
(2) Prislisomus latus } lateral aspect, wanting head. 
Fossil Fish from Beds of Triassic Age, near Gosford. 
in g the merest trace of a disposition to break in any 
one direction. It is, therefore, a perfect freestone. 
If proof were wanting of its perfect suitability even 
for the refinement of the builder's art, we can point 
1 Woodward’* Fossil Fish of the Hawkeebury Series at Gosford, Plate ii. 
