When, also, our imperfect acquaintance with the travertino of Italy, and other very modern limestones containing freshwater shells, is considered,** the continual deposition of which, at the present time, cannot be questioned (though probably the greater part of the masses which consist of them may belong to an era preceding the actual condition of the earth's surface) it would seem that the whole subject of these newer calcareous formations requires elucidation: and, if the inferences connected with them do not throw considerable doubt upon some opinions at present generally received, they show, at least, that a great deal more is to be learned respecting the operations and products of the most recent geological epochs, than is commonly supposed.
(*Footnote.

Conybeare and Phillips Outlines etc.

page 11, Geological Transactions 1 page 327 etc.

Taylor in Geological Transactions 2nd series Volume 2 page 371.

Mr.Taylor states the important fact that the remains of unknown animals are buried together with the shells in the crag of Suffolk; but does not mention the nature of these remains.