...formed ?" Lyell thought that " river erosion" will account for most of the phenomena, but added, " I should infer considerable oscillations in the level of the land in that part of France." Murchison took up the same position, but claimed for the phenomena the action of much stronger and...

...reference to the secular phenomena indicated by the fluviatile gravel of Abbeville and Amiens : " To explain these changes, I should infer considerable...but not wholly displacing, the course of the ancient river. Lastly, the disappearance of the elephant, rhinoeerus, and other genera of quadrupeds now foreign...

...often terminates abruptly in old river cliffs, besides being covered by a newer unstratified drift. To explain these changes, I should infer considerable...deranging but not wholly displacing the course of ancient rivers. Lastly, the disappearance of the elephant, rhinoceros, and other genera of quadrupeds,...