The American Journal of Science
The American Journal of Science
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In our eReader you can find the full English version of the book. Read The American Journal of Science Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The American Journal of Science
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Stanton.— Mon. U. S. Geol. Survey, vol. xliv, pp. 351, pis. xlvii, Washington, 1903.
This work was first submitted to the Director of the United States Geological Survey as early as 1 897. It was greatly revised and extended by the author up to the time of his death in 1902, and contains the results of his last work.
The Pseudoceratites are considered as retrogressive Cretaceous ammonites, showing the sutures and simple outlines characteristic of the Triassic. They are distinctly accelerated in... development as compared with the Jurassic species. It is shown under Placenticeras that the arrest of development takes effect only after the three principal lateral saddles and lobes are formed in the neanic stage. Up to this stage their development is more complex than in the young of the Jurassic species. This explains the imaginary anachronism of the group in its relations with the apparently more complicated allies of the Jurassic.
Two hundred and six species are described, belonging to fifty- two genera.
What to read after The American Journal of Science?
You can find similar books in the "Read Also" column, or choose other free books by John Rodgers to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Stanton.— Mon. U. S. Geol. Survey, vol. xliv, pp. 351, pis. xlvii, Washington, 1903.
This work was first submitted to the Director of the United States Geological Survey as early as 1 897. It was greatly revised and extended by the author up to the time of his death in 1902, and contains the results of his last work.
The Pseudoceratites are considered as retrogressive Cretaceous ammonites, showing the sutures and simple outlines characteristic of the Triassic. They are distinctly accelerated in... development as compared with the Jurassic species. It is shown under Placenticeras that the arrest of development takes effect only after the three principal lateral saddles and lobes are formed in the neanic stage. Up to this stage their development is more complex than in the young of the Jurassic species. This explains the imaginary anachronism of the group in its relations with the apparently more complicated allies of the Jurassic.
Two hundred and six species are described, belonging to fifty- two genera.
What to read after The American Journal of Science?
You can find similar books in the "Read Also" column, or choose other free books by John Rodgers to read onlineMoreLess
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