The New Encyclopaedia Britannica, Volume 29Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 114
... Triassic Period 18 : 693 , major division of geologic time that began 225,000,000 years ago and lasted 35,000,000 years ; the earliest period of the Mesozoic Era , it follows the Per- mian Period and precedes the Jurassic Period . The ...
... Triassic Period 18 : 693 , major division of geologic time that began 225,000,000 years ago and lasted 35,000,000 years ; the earliest period of the Mesozoic Era , it follows the Per- mian Period and precedes the Jurassic Period . The ...
Page 115
... Triassic Series , Lower ; Triassic Series , Middle ; Triassic Series , Upper Triassic Series , Lower , lowermost of the three major divisions of Triassic rocks ( the Triassic Period began about 225,000,000 years ago and lasted about ...
... Triassic Series , Lower ; Triassic Series , Middle ; Triassic Series , Upper Triassic Series , Lower , lowermost of the three major divisions of Triassic rocks ( the Triassic Period began about 225,000,000 years ago and lasted about ...
Page 203
... Triassic ( about 225,000,000 years ago ) . Most of the 200 to 250 living species are aquatic or semi - aquatic , and the majority are found in or near the tropics , but many range into temperate regions . Some turtles are terre- strial ...
... Triassic ( about 225,000,000 years ago ) . Most of the 200 to 250 living species are aquatic or semi - aquatic , and the majority are found in or near the tropics , but many range into temperate regions . Some turtles are terre- strial ...
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