The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 182
... Period . The final period of the Lower Precambrian ( which came to an end approximately 3,000,000,000 years ago ) was marked by important orogenic processes , traces of which are clearly defined in the West Nile System on the borders of ...
... Period . The final period of the Lower Precambrian ( which came to an end approximately 3,000,000,000 years ago ) was marked by important orogenic processes , traces of which are clearly defined in the West Nile System on the borders of ...
Page 183
... Period are of continental rather than marine origin and are included in the Karroo System in South Africa . There , the Lower Permian strata are known as the Ecca Series and are di- vided into three groups - the Lower Ecca , containing ...
... Period are of continental rather than marine origin and are included in the Karroo System in South Africa . There , the Lower Permian strata are known as the Ecca Series and are di- vided into three groups - the Lower Ecca , containing ...
Page 257
... period . Cattle had become very rare , and the drawings were reduced to between seven and 16 inches ( 17 to 40 centimetres ) in length , whereas in the earlier sub - periods they were between 10 and 20 inches ( 25 to 50 centimetres ) in ...
... period . Cattle had become very rare , and the drawings were reduced to between seven and 16 inches ( 17 to 40 centimetres ) in length , whereas in the earlier sub - periods they were between 10 and 20 inches ( 25 to 50 centimetres ) in ...
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