 | Charles Loring Brace - 1869 - 462 Seiten
...any historical period with which we are acquainted. It must have required, says Sir Charles Lyell, a long period for the wearing down of the chalk which supplied the broken llints (stones) for the formation of so much gravel at various heights, sometimes 100 feet ahove the... | |
 | 1860 - 448 Seiten
...might not be due to such river-Hoods as we have witnessed in Scotland during the last halfcentury. It must have required a long period for the wearing...various heights, sometimes one hundred feet above the level of the Somme, for the deposition of fine sediment including entire shells, both terrestrial and... | |
 | J. Boyes - 1873 - 208 Seiten
...and fossil evidences lead to opposite conclusions. Sir C. Lyell, in speaking of this valley, says, " It must have required a long period for the wearing...sometimes one hundred feet above the present level of the Somme, for the deposition of fine sediment, including marine shells, both terrestrial and aquatic,... | |
 | Richard Owen - 2003 - 472 Seiten
...Amiens flint instruments to be great indeed, if compared to the times of history or tradition. . . ." " It must have required a long period for the wearing...formation of so much gravel at various heights, sometimes 100 feet above the present level of the Somme, for the deposition of fine sediment including entire... | |
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... feet above the present level of the Somme, for the deposition of fine sediment, including entire shells, both terrestrial and aquatic, and also for the denudation which the entire mass of stratified drift has undergone : portions having been swept... 
