CONTENTS. 
Stratigraphic geology—Continued. page 
Oak Grove sand member. 104 
Shoal River marl member... 104 
Miocene . 10(5 
General remarks ..., r ... 106 
Jacksonville formation .. 108 
Stratigraphic position . 108 
Lithologic character . 108 
Thickness . HO. 
Physiographic expression . Ill 
Paleontologic character .... Ill 
Structure . Ill 
Local details . 112 
Choctawhatchee marl . 114 
Stratigraphic position . H4 
Lithologic character. 115 
Thickness ... .. 116 
Physiographic expression. 116 
Paleontologic character . 116 
Structure . 116 
Local details . 117 
Pliocene . 123 
Caloosahatchee marl . 123 
Stratigraphic position . 124 
Lithologic character .. 121 
Thickness . 124 
Physiographic expression. 124 
Paleontologic character .. . 124 
Structure . 125 
Local details . 126 
Nashua marl . ‘128 
Stratigraphic position . 128 
Lithologic character . 129 
Thickness .... .... 129 
Physiographic expression. 129 
Paleontologic character . 129 
Structure . 130 
Local details ...... . 130 
Alachua clay .. 133 
Stratigraphic position . 134 
Lithologic character . 134 
Thickness ... 134 
Physiographic expression . 134 
Paleontologic character . 135 
Structure . 135 
Local details . 135 
Bone Valley gravel ... 138 
Stratigraphic position . 139 
Lithologic character . 139 
Thickness . •.. 139 
Physiographic expression .. 140 
Paleontologic character . 140 
