The New Encyclopaedia Britannica, Volume 23Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 246
... remains or trace of insects in the geological record of the Earth . The fossil record of insects is poorly known because insects are not readily preservable ; although more than 700,000 species of mod- ern insects are known , insects ...
... remains or trace of insects in the geological record of the Earth . The fossil record of insects is poorly known because insects are not readily preservable ; although more than 700,000 species of mod- ern insects are known , insects ...
Page 247
... remains 3 : 940h graptolite shales and distribution 7 : 567g hard parts and preservation types 7 : 556a index fossil difficulties 3 : 859c permafrost preservation of animals 14 : 90c ; illus . plant fossil types and detail 7 : 574c ...
... remains 3 : 940h graptolite shales and distribution 7 : 567g hard parts and preservation types 7 : 556a index fossil difficulties 3 : 859c permafrost preservation of animals 14 : 90c ; illus . plant fossil types and detail 7 : 574c ...
Page 1004
... remains of plants and dinosaurs such as Tyrannosaurus and Triceratops ; new tech- niques of screening material through fine- meshed material have yielded remains of many , generally small , Cretaceous mammals from the Hell Creek ...
... remains of plants and dinosaurs such as Tyrannosaurus and Triceratops ; new tech- niques of screening material through fine- meshed material have yielded remains of many , generally small , Cretaceous mammals from the Hell Creek ...
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