The New Encyclopaedia Britannica, Volume 24Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 660
... Permian Period ( the Permian Period began about 280,000,000 years ago and lasted about 55,000,000 years ) . The for- mation was named for outcrops studied in the type locality of Kaibab Gulch , near Paria , Utah . The Kaibab Limestone ...
... Permian Period ( the Permian Period began about 280,000,000 years ago and lasted about 55,000,000 years ) . The for- mation was named for outcrops studied in the type locality of Kaibab Gulch , near Paria , Utah . The Kaibab Limestone ...
Page 716
... Permian ) , Dwyka Series ( Lower Permian ) . Karroo sediments are nonmarine and consist of shales , red beds , siltstones , and great quan- tities of volcanics . Floras and faunas of the Karroo are terrestrial and appear to record a ...
... Permian ) , Dwyka Series ( Lower Permian ) . Karroo sediments are nonmarine and consist of shales , red beds , siltstones , and great quan- tities of volcanics . Floras and faunas of the Karroo are terrestrial and appear to record a ...
Page 971
... Permian time ( from 280,000,000 to 225,000,000 years ago ) certain genera had become terrestrial ; but both early members of the group and late degenerate forms were aquatic . The body was generally shaped like that of a newt or stoutly ...
... Permian time ( from 280,000,000 to 225,000,000 years ago ) certain genera had become terrestrial ; but both early members of the group and late degenerate forms were aquatic . The body was generally shaped like that of a newt or stoutly ...
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