/2938/ The Hearston sandstone makes the two mountain ranges while the valleys in between are of Alynfham rocks. These are a much metamorphosed district making the Catrothian schist and into this has been pressed a granite often very coarse grained. This is these ancient rocks that the material of the Hearston is composed, a coarse grained grit and won free conglomeratic sandstone. This series and the Harpur's shale are much altered. As the basal layers of the Shennandral limestone are said to have Lown Cambrian fossils, the same also in the Centricter sand-stone, the question arises how far do these deposits extend to the west. Are they eastern deposits upon the western land? Certain it is that the Para-Trias refuses in them. Or the higher Shennandra limestones come in from the west and refuse directly upon the lower beds respecting the sequence and character of the Stockbridge limestone? There are questions of importance in paleogeography.