The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 89
... Lower to upper Eocene . Fossils from North America and Asia . Limb structure similar to that of Hyracotherium , teeth already tapiroid . Four genera . + Family Helaletidae . Lower Eocene to middle Oligocene . Fossils from North America ...
... Lower to upper Eocene . Fossils from North America and Asia . Limb structure similar to that of Hyracotherium , teeth already tapiroid . Four genera . + Family Helaletidae . Lower Eocene to middle Oligocene . Fossils from North America ...
Page 490
... Lower Carboniferous ; cranial roof short , cheek bones reduced or absent , gill covers scaled ; 1 pair of upper and 1 pair of lower shearing or crushing tooth plates ; trunk shield short , lacking posterior bones ; pectoral fins narrow ...
... Lower Carboniferous ; cranial roof short , cheek bones reduced or absent , gill covers scaled ; 1 pair of upper and 1 pair of lower shearing or crushing tooth plates ; trunk shield short , lacking posterior bones ; pectoral fins narrow ...
Page 560
... Lower Ludhamiant Tegelen Waltoniant Brüggen Coralline Cragt Reuver Clay Pliocene * Correlations , particularly in the lower part of the sequence , are uncertain and provisional . † Marine units . The dates of the youngest major cold ...
... Lower Ludhamiant Tegelen Waltoniant Brüggen Coralline Cragt Reuver Clay Pliocene * Correlations , particularly in the lower part of the sequence , are uncertain and provisional . † Marine units . The dates of the youngest major cold ...
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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