Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Página 245
... genera were also the largest ; Paradoxides sometimes reaching a length of nearly two feet . Yet contemporaneous with this large creature were some diminutive forms . A few genera ( among them Agnostus ) were blind ; but most possessed ...
... genera were also the largest ; Paradoxides sometimes reaching a length of nearly two feet . Yet contemporaneous with this large creature were some diminutive forms . A few genera ( among them Agnostus ) were blind ; but most possessed ...
Página 251
... genera were Cyathaxonia , Cyathophyllum , and Zaphrentis . There were likewise less numerous and more delicate compound forms belonging to what are known as the Tabulate corals ( Favosites , Halysites ) , while another type ( Heliolites ...
... genera were Cyathaxonia , Cyathophyllum , and Zaphrentis . There were likewise less numerous and more delicate compound forms belonging to what are known as the Tabulate corals ( Favosites , Halysites ) , while another type ( Heliolites ...
Página 252
... genera of star - fishes found in the Silurian system are Palæaster , Palæasterina ( Fig . 123 , b ) , Palæochoma . Brittle - stars were represented by Protaster . Throughout great In the Silurian system are found many tracks. 252 CHAP ...
... genera of star - fishes found in the Silurian system are Palæaster , Palæasterina ( Fig . 123 , b ) , Palæochoma . Brittle - stars were represented by Protaster . Throughout great In the Silurian system are found many tracks. 252 CHAP ...
Página 253
... genera appeared . In the Lower Silurian series some of the more abundant genera are Asaphus , Ampyx , Ogygia , and Trinucleus ; in the Upper Silurian division characteristic genera are Calymene , Phacops , Encrinurus , Illanus , and ...
... genera appeared . In the Lower Silurian series some of the more abundant genera are Asaphus , Ampyx , Ogygia , and Trinucleus ; in the Upper Silurian division characteristic genera are Calymene , Phacops , Encrinurus , Illanus , and ...
Página 254
... genera Ctenodonta and Modiolopsis , with new forms such as Orthonota ( Fig . 128 ) , Cleido- phorus and Ambonychia . a d b e C FIG . 125. - Lower and Upper Silurian Trilobites . ( a ) Asaphus tyrannus ( 3 ) ; ( b ) Ogygia Buchii ( 3 ) ...
... genera Ctenodonta and Modiolopsis , with new forms such as Orthonota ( Fig . 128 ) , Cleido- phorus and Ambonychia . a d b e C FIG . 125. - Lower and Upper Silurian Trilobites . ( a ) Asaphus tyrannus ( 3 ) ; ( b ) Ogygia Buchii ( 3 ) ...
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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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