The Chain of Life in Geological Time Microform a Sketch of the Origin And Su
The Chain of Life in Geological Time Microform a Sketch of the Origin And Su
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Secondly, the Middle Laurentian, the greater part of which consists of gneiss, but containing important beds f other rocks, as quartzite, iron ore, and limestone. It is in this series that we have the first evidence of life, and it is here also that we find the greatest abundance of carbon, in the form of graphite or plumbago, and also of calcium phosphate, or bone earth. Thirdly, the Upper Laurentian or Norian series. This consists in great part of Labadorite, or lime feldspar, but has also be...ds of ordinary gneiss, limestone, and iron ore.
a b, c d FIG. 14. Ideal section, showing the relations of the Laurentian and Huronian.
a, Lower Laurentian. B, Middle Laurentian. C. Upper Laurentian. J, Hurcn!an. E, Cambrian and Silurian.
The latter, the Huronian, is much less crystalline, and is divisible into two series the Lower Huronian, which includes many beds of volcanic origin, and the Upper Huronian, which has afforded some obscure fossils. The Huronian was first recognised by Sir W. E. Logan in Canada, but corresponding rocks exist in Europe.
What to read after The Chain of Life in Geological Time Microform a Sketch of the Origin And Su?
You can find similar books in the "Read Also" column, or choose other free books by John William Dawson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Secondly, the Middle Laurentian, the greater part of which consists of gneiss, but containing important beds f other rocks, as quartzite, iron ore, and limestone. It is in this series that we have the first evidence of life, and it is here also that we find the greatest abundance of carbon, in the form of graphite or plumbago, and also of calcium phosphate, or bone earth. Thirdly, the Upper Laurentian or Norian series. This consists in great part of Labadorite, or lime feldspar, but has also be...ds of ordinary gneiss, limestone, and iron ore.
a b, c d FIG. 14. Ideal section, showing the relations of the Laurentian and Huronian.
a, Lower Laurentian. B, Middle Laurentian. C. Upper Laurentian. J, Hurcn!an. E, Cambrian and Silurian.
The latter, the Huronian, is much less crystalline, and is divisible into two series the Lower Huronian, which includes many beds of volcanic origin, and the Upper Huronian, which has afforded some obscure fossils. The Huronian was first recognised by Sir W. E. Logan in Canada, but corresponding rocks exist in Europe.
What to read after The Chain of Life in Geological Time Microform a Sketch of the Origin And Su?
You can find similar books in the "Read Also" column, or choose other free books by John William Dawson to read onlineMoreLess
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