CONTENTS 



PAGE 



Fossils of Cambrian Age 88 



The Beekmantown Limestone 89 



Lithologic Character 92 



Faunal Zones 96 



Stonehenge Member 96 



Cryptozoon steeli Zone 101 



Ceratopea Zone 103 



Turritoma Zone 104 



Topography and Residual Products 105 



Areal Distribution 109 



Frederick Valley Limestones Ill 



The Beekmantown Limestone 114 



The Frederick Limestone 115 



The Stones River Limestone 117 



General Sections 117 



Lithologic Character 121 



Paleontology 121 



Lower Stones River 122 



Middle Stones River 124 



Upper Stones River 126 



Areal Distribution and Topographic Features 126 



Fauna of the Stones River in Maryland 127 



The Chambersburg Limestone 129 



Lithologic Character 130 



Areal Distribution 132 



Faunal Zones 132 



Caryocystites Bed 133 



Tetradium cellulosum Bed 136 



Echinospherites Bed 139 



Nidulites Bed 140 



Christiania Bed 142 



Greencastle Bed 143 



Sections of the Chambersburg Limestone 144 



East of Martinsburg Shale Belt 144 



West of Martinsburg Shale Belt 147 



Variations in Distribution 152 



Age and Correlation 153 



UPPER OEDOVICIAN SHALES 134 



The Martinsburg Shale 154 



Lithologic Character and Sections 157 



Topographic Features and Areal Distribution 161 



Faunas 163 



Sinuites Bed of Trenton Age 163 



Corynoides Bed of Trenton Age 165 



Eden Division 167 



Maysville Sandstone Division 168 



The Juniata Formation 170 



TABLES SHOWING DISTRIBUTION OF SPECIES 174 



