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IV.—On the Formation of Deltas: and on the Evidence and Cause of Great Changes in the Sea-Level during the Glacial Period1

Published online by Cambridge University Press:  01 May 2009

Alfred Tylor
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Extract

The first portion of this paper is devoted to a comparison of the Delta deposits of the Po, Mississippi, and Ganges, by means of the descriptions of the strata obtained from borings in their Deltas for water. The surfaces of these Deltas, and the alluvial plains above them, are compared together, with reference to their height above the sea and inclination, and it is found that a parabolic curve drawn through the extremities of each river, and through one point in its course, nearly represents its longitudinal section,-the greatest deviation being 30 feet in some of the largest Deltas. The Delta deposits are found to be coarser and more sandy near the bottom, and indicate more rapid rivers and greater rainfall at the earlier portion of their history.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 99 , September 1872 , pp. 392 - 399
Copyright
Copyright © Cambridge University Press 1872

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Footnotes

1

Being the text in full of a paper read by the author before the Geological Society of London, November 11, 1868, but only published in brief abstract in the Quart. Journ. Geol. Soc., 1869, vol. xxv., p. 7.

The views embodied in this paper received little favour at the time of their first enunciation; but having since been adopted by some geological writers, the author is desirous that the full text of his paper (as delivered to the Geological Society in 1868) should be made known, in order that his claim to priority may be recognized.

References

page 394 note 1 Searles Wood, in a letter to A. Tylor respecting the height of the Crag.

page 396 note 1 Mr. Hopkins treated the force as vertical, and did not observe flexures.

page 396 note 2 The most favourable situation for boring for coal is between Fairlight Glen and Crowboro Beacon.

page 398 note 1 Brit. Assoc. Reports, Dundee, 1867, p. 431.

page 398 note 2 Abstract “On Loess of the Valleys of the South of England and the Somme”. Geol. Journ., p. 504, vol. xix., 1863.

page 399 note 1 See Quart. Journ. Geol. Soc. Lond., 1868, May 10, vol. xxiv. pp. 455–6.

page 399 note 2 Pfeffer, “On the Vistula”, Dantzic, 1849. The gorging of ice at the mouth of the Thames, Seine, and Somme may have assisted in the production of some of the remarkable gravel-beds in these rivers.