The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 75
... ORIGIN AND EVOLUTION The evolution of the turtle is one of the most remarkable in the history of vertebrates . Unfortunately , the origin of this highly successful order is obscured by the lack of early fossils , although turtles leave ...
... ORIGIN AND EVOLUTION The evolution of the turtle is one of the most remarkable in the history of vertebrates . Unfortunately , the origin of this highly successful order is obscured by the lack of early fossils , although turtles leave ...
Page 1111
... Origin of tillites . A tillite is , by definition , an ancient , consolidated till and must therefore be of glacial origin . In the case of Recent tills ( those formed during the last 10,000 years ) , the connection with glaciers or ice ...
... Origin of tillites . A tillite is , by definition , an ancient , consolidated till and must therefore be of glacial origin . In the case of Recent tills ( those formed during the last 10,000 years ) , the connection with glaciers or ice ...
Page 1112
... origin . If consolidation was slight , the clasts will appear as rounded or convoluted lumps ; but limestones , which tend to indurate rapidly , often form angular breccias that are sometimes called sharpstone conglomerates . An apron ...
... origin . If consolidation was slight , the clasts will appear as rounded or convoluted lumps ; but limestones , which tend to indurate rapidly , often form angular breccias that are sometimes called sharpstone conglomerates . An apron ...
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