^{page 327 note 1} A trivial objection is made to the use of the term Black Crag, that the deposit is unrepresented in England, and is therefore not Crag. But by use and wont “Crag”is all but synonymous with Pliocene, and similar exception might be taken in every case where a foreign series bears the name of its less—developed British, equivalent.

^{page 328 note 1} The Red Crag of Suffolk and the yellow flagstones of the Carboniferous Rocks are, in certain cases of protection from oxidation of their contained iron, of a greyishblue colour.