i to bo OT Oo DD 
C1 Sd Ot 
w 
10 
11 
12 
13 
14 
15 
16 
N. Z. ROCKS, 147 
Hornblende Porphyry, showing the gradual oxida- 
tion from the exterior. 
Hard Compact Tufa Breccia. 
Blue Clay, or Mullock. 
Diorite. 
Argillaceous Tufa Sandstone. 
Awiriferous Pyrites. 
Calcareous Tufa, containing Pyrites. 

CENTRAL VOLCANIC DISTRICT. 
WuitkE ISLanp. 
Basaltic Lava. 
Basaltic Lava. 
Argilo Trachyte Porphyry. 
Obsidian. Mayor Island. 
Obsidian Breccia. Mayor Island. 
Tauro LAKE, AND NEIGHBOURHOOD. 
Red Trachyte. 
Vesicular Obsidian, or Pumice Stone. 
Vesicular Obsidian, or Pumice Stone. 
Granitoid Trachyte. 
TONGARIRO. 
Basaltic Lava. 
Tufaceous Breccia. Active Cone. 
Basaltic Lava. 
Trachyte Porphyry. 
RvuapeHu, OnETAPU,—HAST BASE OF MOUNTAIN. 
Trachyte Lava. 
Vesicular Trachyte Lava. 
Pumiceous Trachyte Porphyry. 
Vesicular Trachyte Porphyry. 
Pumiceous Trachyte Porphyry 
Compact Trachyte Porphyry. 
Argilo Trachyte Porphyry. ~ 
Argilo Trachyte Porphyry. 
