Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Página xviii
... Brachiopod ( Lingulella Davisii ) , natural size 246 120. An Upper Silurian sea - weed ( Chondrites versimilis ) ... Brachiopods 128. Silurian Lamellibranch 255 256 129. Silurian Gasteropod . 256 130. Silurian Cephalopods 257 131 ...
... Brachiopod ( Lingulella Davisii ) , natural size 246 120. An Upper Silurian sea - weed ( Chondrites versimilis ) ... Brachiopods 128. Silurian Lamellibranch 255 256 129. Silurian Gasteropod . 256 130. Silurian Cephalopods 257 131 ...
Página xix
... Brachiopods 264 139. Devonian Lamellibranch and Cephalopod 265 140. Section of part of the Cape Breton coal - field ... Brachiopods 154. Carboniferous Lamellibranchs 155. Carboniferous Gasteropods 156. Carboniferous Pteropod 157 ...
... Brachiopods 264 139. Devonian Lamellibranch and Cephalopod 265 140. Section of part of the Cape Breton coal - field ... Brachiopods 154. Carboniferous Lamellibranchs 155. Carboniferous Gasteropods 156. Carboniferous Pteropod 157 ...
Página 253
... more abundant and varied in the Silurian than in the Cambrian rocks . Among the more characteristic Silurian genera of Brachiopods are Atrypa , Leptana , Orthis , Pentamerus , Rhynchonella , and Strophomena ( Fig . 127. XVIII 253 SILURIAN.
... more abundant and varied in the Silurian than in the Cambrian rocks . Among the more characteristic Silurian genera of Brachiopods are Atrypa , Leptana , Orthis , Pentamerus , Rhynchonella , and Strophomena ( Fig . 127. XVIII 253 SILURIAN.
Página 264
... Brachiopods . ( a ) Uncites gryphus ( 3 ) ; ( b ) Stringocephalus Burtini ( 3 ) ; ( c ) Spirifera disjuncta ( Verneuillii ) ( } ) . striking contrast to their profusion among the Silurian strata , and they seem to have entirely died out ...
... Brachiopods . ( a ) Uncites gryphus ( 3 ) ; ( b ) Stringocephalus Burtini ( 3 ) ; ( c ) Spirifera disjuncta ( Verneuillii ) ( } ) . striking contrast to their profusion among the Silurian strata , and they seem to have entirely died out ...
Página 267
... brachiopods , and other calcareous organisms which swarmed in the clearer parts of the sea ; sandstones often full of coaly streaks and remains of terrestrial plants ; dark shales not infrequently charged with vegetation , and ...
... brachiopods , and other calcareous organisms which swarmed in the clearer parts of the sea ; sandstones often full of coaly streaks and remains of terrestrial plants ; dark shales not infrequently charged with vegetation , and ...
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Términos y frases comunes
abundant accumulated acid Ammonites ancient Assistant Master beds BOOK bottom Brachiopods calcareous calcite Cambrian Cambridge carbonate of lime Carboniferous Chapter chiefly clay College containing corals Cretaceous crinoids crystalline crystals decay deposits detritus Devonian earth earth's crust Edited ELEMENTARY Eocene eruptive Europe evidence example extinct fauna Fcap feet fissures fossils genera GEOGRAPHY geological history glacier globe gradually granite gravel GREEK ground Illustrated Jurassic kinds known lakes land lava layers limestone living lower marine marls mass materials Mesozoic mineral Miocene mountains natural occur Old Red Sandstone organic remains original Palæozoic Paleozoic period Permian plants and animals Pliocene present preserved Prof Professor quartz Red Sandstone regions revised rivers rocks sand schists sediment sedimentary sedimentary rocks shales sheets shells siliceous Silurian soil solid sometimes species stone strata structure substance surface terrestrial Tertiary thick trace Triassic upper various vegetation volcanic
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