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MARYLAND GEOLOGICAL SURVEY
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11
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PAGE
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THE PIEDMONT PLATEAU.............................................
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. 148
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The Eastern Division...........................................
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. 148
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The Western Division...............................................
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. 149
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THE APPALACHIAN REGION...........................................
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. 150
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The Eastern Division...............................................
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. 150
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The Central Division...............................................
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. 151
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The Western Division..............................................
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. 152
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GEOLOGY..............................................................
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. 153
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THE PIEDMONT PLATEAU.............................................
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. 159
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The Eastern Division...............................................
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. 161
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The Archean and Algonkian Periods...............................
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. 161
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The Gneiss.....................................................
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. 162
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The Quartz-schist.............................................
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. 163
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The Marble...................................................
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. 164
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The Gabbro...................................................
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. 164
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The Peridotite and Pyroxenite...................................
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. 165
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The Diorite...................................................
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. 166
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The Granite...................................................
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. 167
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The Later Periods...............................................
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. 168
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The Quartzite.................................................
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. 168
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The Phyllite...................................................
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. 168
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The Diabase...................................................
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. 168
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The late Mesozoic and Cenozoic Deposits.........................
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. 168
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The Western Division...............................................
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. 169
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The Algonkian Period...........................................
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. 169
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The Basic Volcanics............................................
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. 169
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The Cambrian and Silurian Periods...............................
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. 169
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The Quartzite.................................................
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. 170
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The Phyllite and Crystalline Limestone.........................
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. 170
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The Triassic Period...............................................
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. 171
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The Newark Formation.........................................
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. 171
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The Diabase...................................................
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. 171
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THE APPALACHIAN REGION.........................................
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. 172
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The Algonkian Period...........................................
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. 174
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The Acid Volcanics.............................................
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. 174
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The Basic Volcanics...........................................
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. 175
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The Granite...................................................
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. 175
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The Cambrian Period.............................................
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. 176
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The Loudoun Formation.......................................
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. 176
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The Weverton Formation.......................................
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. 177
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The Harpers Formation.........................................
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. 177
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The Antietam Formation.......................................
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. 178
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The Shenandoah Formation.....................................
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. 179
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The Silurian Period...............................................
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. 179
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The Shenandoah Formation.....................................
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. 180
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The Martinsburg Formation.....................................
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. 180
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The Juniata Formation.........................................
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. 180
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The Tuscarora Formation.......................................
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. 181
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