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III.—The Development of Land
Published online by Cambridge University Press: 01 May 2009
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.
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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.
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