Page:Quarterly Journal of the Geological Society of London, vol. 25.djvu/418

314 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 9, hinder half of the alveolar margin of the bone. Each praemaxilla sends two processes upwards and backwards, one in front of, and one behind, the nasal aperture, to meet the large nasal bone. Discussion. Mr. Boyd Dawkins made some remarks as to the stratigraphical range of Megalosaurus. The oldest example with which he was acquainted was a tooth from the Lias of Lyme. It occurred also in the Lower Oolite of Dorset. Higher up it was found in the Kimmeridge Clay, and again in the Tilgate Beds of the Wealden. He had, however, himself found it in the Wadhurst Clay, above the Ashdown Sands, near Battle. He had also seen remains in still higher beds, possibly of Lower-Greensand age, at Potton; but in this case the bones were probably derivative. An animal with almost identical teeth, the Teratosaurus suevicus of Von Meyer, occurred in the Lower Keuper, and possibly might belong to the same generic form. The President agreed that the Dinosaurians had occurred in the Trias, and that he was quite prepared for an extension of the family into earlier beds. June 9, 1869. William Shelford, Esq., Memb. Inst. C.E., 7 Westminster Chambers, Victoria Street, S.W.; E. Teschemacher, Esq., 1 Highbury Park, N.; George Ludovic Houstoun, Esq., of Johnstone Castle, Renfrewshire; and T. P. Barkas, Esq., Newcastle-upon-Tyne, were elected Fellows of the Society. The following communications were read:—

1. Notes on the Sutherland Gold-field. By the Rev. J. M. Joass. With an Introduction by Sir Roderick I. Murchison, Bart., K.C.B., F.R.S., V.P.G.S.

[Plate XIII.]

Introduction. The district of Sutherland in which gold has been recently discovered and worked, in certain waterworn materials and graveUy detritus which cover the crystalline Lower Silurian rocks in several depressions at and near Kildonnan in Sutherland, is the eastern extremity of a region which I have personally explored at intervals for the last forty-three years. It was, however, only in the year 1858 that I fully satisfied myself as to the relative ages and order of superposition and character of all the various rock-formations which occur between the western and eastern coasts of Sutherland and Ross. It was then that for the first time I was enabled to show distinctly an ascending order from the fundamental gneiss or Laurentian rocks of the northern highlands, through great masses of sandstone and conglomerate of Cambrian age, upwards through overlying quartz-rocks