Page:Transactions of the Geological Society, 1st series, vol. 2.djvu/510

500 the marked difference between the two great varieties, which appear to include by far the larger part of the stratified rocks occurring in the west of England, is such, as to render it by no means desirable that they should both be designated by the common name of grauwacke; a name perhaps the more liable to misapplication as it is somewhat indefinite.