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III.—The Development of Land

Published online by Cambridge University Press:  01 May 2009

J. Clifton Ward
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Extract

Whenever a bone is about to be produced in the animal body, its form is first sketched out in connective tissue or cartilage, and then ossification commences at one or several points; if there is but one centre of ossification, or if several centres unite, but one bone is formed; if the several centres do not completely unite, as many separate bones are produced.

Type
Original Articles
Information
Geological Magazine , Volume 8 , Issue 79 , January 1871 , pp. 11 - 15
Copyright
Copyright © Cambridge University Press 1871

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References

page 12 note 1 Rocks of Silurian age occur in Sardinia, according to General della Marmora (Voyage en Sardaigne).

page 12 note 2 There may have been some minor upheavals, producing local unconformities in the several groups of strata.

page 12 note 3 In Sardinia are evidences of volcanic eruption in Miocene times; and very probably some of the eruptive rocks of the neighbourhood of Genoa date from this period.

page 14 note 1 Etna dates clearly from the Pliocene period; its earlier eruptions being submarine, ashes and lavas interbedded with Pliocene strata.

page 14 note 2 See “Geological Dream on Skiddaw,” in “Ice,” a Lecture, etc.

page 15 note 1 “On the Denudation of the Lake District,” Geol. Mag., 01, 1870.Google Scholar

page 15 note 2 It is curious to think how much older our English mountain districts are than the great ranges of the Alps, the Apennines, the Himalayas, the Andes, and the Rocky Mountains.