The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 99
... Early and early Late Permian . Desert conditions must have been wide- spread in North America and in Siberia during this latest Permian time . The Late Paleozoic was a time of widespread mountain building and volcanism , although in ...
... Early and early Late Permian . Desert conditions must have been wide- spread in North America and in Siberia during this latest Permian time . The Late Paleozoic was a time of widespread mountain building and volcanism , although in ...
Page 741
... Early Cretaceous , were types with heavy ribs , fine to coarse warts , and radial equatorial appendages . Many of these have affinities with the living fern family Schizaeaceae . Jurassic and Early Cretaceous megaspores are more ...
... Early Cretaceous , were types with heavy ribs , fine to coarse warts , and radial equatorial appendages . Many of these have affinities with the living fern family Schizaeaceae . Jurassic and Early Cretaceous megaspores are more ...
Page 957
... Early Precambrian ( see EARTH , HEAT FLOW IN ) . Precambrian sediments show several distinctive fea- tures . Chemical deposits such as carbonates , banded iron formations , and cherts are conspicuous . The earliest iron formations date ...
... Early Precambrian ( see EARTH , HEAT FLOW IN ) . Precambrian sediments show several distinctive fea- tures . Chemical deposits such as carbonates , banded iron formations , and cherts are conspicuous . The earliest iron formations date ...
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activity America animals appear areas atoms became become body called camera century changes characteristics chemical Church colour common complete compounds consists containing continued drugs early effect electrons elements energy example existence experience Family field Figure fins fishes groups human important increase individual industry Italy known later lens less light liquid living lower major material means ment methods move movement natural North object occur organic original Peking Pentecostal percent period permafrost personality pest Peter petroleum Philip philosophy photographs plants political position possible practice present printing problems production Quakers range region result rocks similar social South species structure surface temperature theory tion United usually widely