266 Reports and Proceedings. 



OrtMs crispa, Cardiola ifiterrupta, Orihoceras filosum, 0. tenuistriatum, 

 and 0. subannulatum. 



4. " On the Lower Silurian Eocks of the Isle of Man." By Prof. 

 E. Harkness, F.E.S., F.G.S., and H. Nicholson, Esq. 



The older sedimentary deposits which occupy the greater part of the 

 island, have been regarded by previous observers as Lower Silurian. 

 These slates were described by the authors as forming an anticlinal axis 

 which traverses the island in a north-east and south-west direction, 

 and to be conformably overlain at Douglas Head and Banks How 

 on the south-eastern part of the island, by green ash-beds (slates and 

 porphyries) . 



The only fossil of the slates is the Palceochorda major of the Skid- 

 daw slates ; and from the circumstance that the Lower Silurian rocks 

 of the Isle of Man are in the exact line of strike of the Skiddaw slates 

 of the Lake-country, the authors regarded these beds as correspond- 

 ing with them; and the "green ash-beds" were considered to be 

 the equivalents of the ash-beds and porphyries which succeed the 

 Skiddaw slates. 



The folloMdng specimens were exhibited : — Silurian Fossils from 

 Cumberland and the Isle of Man ; exhibited by Prof. Harkness and 

 H. Nicholson, Esq. — Specimens of Acanthodes from the North-Staf- 

 fordshire Coal-field ; exhibited by J. Ward, Esq. — Copper Ores from 

 Lake Superior, and a specimen of Salt from a remarkable deposit 

 150 feet above the level of the surrounding swamp, near the shores 

 of the Gulf of Mexico, Louisiana ; presented by the Hon. J. D. C&.ton. 

 — Six photographs of ancient sculptures on Eeindeer-horn ; pre- 

 sented by the Mai"quis de Yibraye, For. Corr. G.S. 



The Edinburgh Geological Society. — April 5th. — E. A. F. A. 

 Coyne, Esq., C.E., V.P., in the chair. The Eight Honorable William 

 Chambers, F.G.S., Lord Provost of the City of Edinburgh, was 

 unanimously elected a Fellow. 



Mr. Thomas Smyth read the first part of a paper, which was il- 

 lustrated by diagrams, entitled, " Additional Observations on the 

 Upheaval of the Shores of the Firth of Forth and part of the East 

 Coast of Scotland dmring the Human Period." In introducing the 

 subject he recapitulated the evidence contained in a former paper 

 read in December, 1864, to show that many upheavals of the land 

 had taken j)lace during the human period. The author's remarks 

 would now extend from the close of the Post-Pliocene period to the 

 time when a Celtic population inhabited the Lowlands of Scotland. 

 During the Post-Pliocene era the land slowly arose, the glaciers left 

 the valleys, and the whole country became of a warmer temperature. 

 The valley -gravels and fine sands, extending from the Water of 

 Leith to Eestalrig, must then have been rearranged and deposited. 

 The land continued elevated for a considerable time, and forests of 

 trees covered the greater portion of Britain ; a submergence after- 

 wards took place, but to what extent is unknown. This submergence 

 is proved by the peat-deposits which are found under marine strata 

 in various parts, and also by remains of submerged forests and peat 



