GLENGARIFF GRITS AND SLATES.
723
he stated that Prof. Dewalque had arrived at the conclusion that the marine Devonian beds of Devonshire and Old Red Sandstone of Hereford were different conditions of beds on the same horizon. In reply to Dr. Hicks, he stated that all palaeontologists were agreed as to the Upper Silurian age of the beds below the Glengariff Grits; and the Lower Silurian age of the metamorphic rocks is proved by the occurrence in them, when unaltered, of Lower Silurian Graptolites. In reply to Dr. Duncan, he stated that the Carboniferous Slate of Ireland was probably on the same horizon as the Upper Devonian of Devonshire.
