The New Encyclopaedia Britannica, Volume 24Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 292
... rocks 9 : 201 , crystalline or glassy earth materials derived from the cooling of silicate melts at or near the Earth's surface . The text article treats the composition , tex- ture , structure , and classification of igneous rocks and ...
... rocks 9 : 201 , crystalline or glassy earth materials derived from the cooling of silicate melts at or near the Earth's surface . The text article treats the composition , tex- ture , structure , and classification of igneous rocks and ...
Page 642
... rocks and time throughout the world . ( The Jurassic Period began about 190,000,000 years ago and lasted about 54,000,000 years . ) Several subdivisions , or stages , each representing smaller spans of time and rocks , are recognized in ...
... rocks and time throughout the world . ( The Jurassic Period began about 190,000,000 years ago and lasted about 54,000,000 years . ) Several subdivisions , or stages , each representing smaller spans of time and rocks , are recognized in ...
Page 777
... rocks of the Cambrian System ; it has been suggested that the youngest Keweenawan rocks actually may be Cambrian in age . In the Lake Superior region , Keeweenawan rocks consist of reddish sandstones , siltstones , shales , and some ...
... rocks of the Cambrian System ; it has been suggested that the youngest Keweenawan rocks actually may be Cambrian in age . In the Lake Superior region , Keeweenawan rocks consist of reddish sandstones , siltstones , shales , and some ...
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