Illustrations. 
1 5 
Page. 
63. 
Folded Silurian Slates ... 
224 
64. 
Slaty Cleavage ... 
224 
65. 
Silurian Corals ... 
225 
66. 
Structure of a Crinoid ... 
229 
67. 
Corals, Great Barrier Reef 
233 
68. 
Plan of Jenolan Caves 
240 
69. 
Silurian Limestones, Molong 
242 
70. 
Halysites 
244 
71. 
Hawkesbury Sandstone ... 
247 
72. 
Granite Rocks, near Tarana 
254 
73. 
Columnar Sandstone, Bondi 
260 
74. 
Map showing fissures, Bondi 
263 
75. 
Hawkesbury Sandstone ... 
267 
76. 
Rock Slice for the Microscope .. 
270 
77. 
Weathering of Sandstones, Maroubra Bay 
271 
78. 
Igneous Dyke, Newcastle 
276 
79. 
Minerals in a Slice of Basalt .. 
283 
80. 
Succession of Rocks, Hartley to Mt. Victoria 
296 
81. 
Dislocation in the Narrabeen Shales ... 
300 
82. 
Katoomba Falls 
305 
83. 
Diagram (after Dana) of the Contour of Hills 
314 
84. 
Narrabeen Shales 
- 
316 
Geological Map Mount Victoria, Hartley, Bla< 
K- 
heath, and the Kanimbla Valley ... face 
P. 
392 
Map of the Country around Sydney, showing 
position of Igneous Dykes ... face title page 
In the photographs of the Igneous # Dykes the undecomposed basalt comes out 
black, as in fig. 15. When the basalt is decomposed the photographs show the 
dykes in a lighter shade than the surrounding shales. 
