LIST OF ILLUSTRATIONS. 
XIX 
72. Section on the outlet of Conesus lake, one mile west of West-Avon, Livingston co.. 133 
73. Section of the bed and bank of Allen’s creek, at Le Roy village. 183 
74. View of Sugar-loaf hill, at Hopeton, on the Crooked-lake outlet. 184 
75. Jointed structure of the cliffs on Cayuga lake. 192 
76. Concretion enclosing a fossil. 193 
77. Septaria. 193 
78. Fossils of the Hamilton group. 196 
79. Ditto 198 
80. ' Ditto 200 
81. Ditto 202 
82. Ditto ... 203 
83. Ditto .. ... 204 
84. Ditto 205 
85. Ditto 207 
86 . Ditto 208 
87. Ditto 209 
88 and 89. Sections illustrating superposition of strata. 211 
90. Tully limestone — Sketch on Seneca lake. 212 
91. Curve in the Tully limestone. 214 
92. Fossils of the Tully limestone. .. 215 
93. Ditto 216 
94. Fossils of the Genesee slate.. 222 
95. Ditto . 223 
96. View of Upper and Middle falls, Portage... 224 
97. Section showing sutdivisions of the Portage group. 226 
98. View on Cashaqua creek..... 226 
99. Septaria, from Portage group... 231 
100. Cone in cone... 232 
101. Cast of flowing mud. 233 
102. Cast of striae .... 235 
103. Cast of mud-furrow with shells.f. 237 
104. Fossils of the Portage group. 241 
105. Ditto 242 
106. Ditto 243 
107. Ditto . 245 
108. Ditto 247 
109. View on Cashaqua creek. 249 
110 . Fall creek, near Ithaca. 250 
111. Chemung Upper narrows. 251 
112. Section showing the succession in the higher groups. 253 
113. Concretionary structure of strata. 257 
114. Ripple-marked surface. 258 
115. Section of cliff showing ripple-marked strata. 258 
