Trans. N.Z. Inst., Vol. XXXVI. 



Pl. XXXI. 



NW 



Thrust-Plane. 



South Side of Tank Gully, Mount Potts. 



a. Tbin-bedded sbales and sandstones. 



b. Grey sandstones. 



//o 



Section across Tank Gully. 



a. Sandstones. 



b. Black carbonaceous shales with fossil fern-leaves. 



^sr 



SE 



SUBDIVISION OF LOWER MESOZOIC. Park. 



