A Retrospect of Geology for Fortij Years. 5 



the Great Whin Sill, on clays, shales, and slates, and on contact 

 metamorphism, T. H. Holland on Laterite, W. F. Hume on the 

 Black Earth of Eussia, and A. P. Pavlow on Sandstone dikes. 



Miss Ogilvie (Mrs. Gordon) gives some results of her researches 

 on the Dolomites of the Tyrol. Marr treats of the Skiddaw Slates, 

 0. A. Matley of the Arenig rocks, while W. Gibson deals with the 

 Palgeozoic rocks of South Africa. 



The fossils discovered by Hicks in what were regai-ded as the 

 unfossiliferous Morte Slates receive attention, and Howard Fox 

 records new localities for fossils in the Devonian of Cornwall. 

 Wheelton Hind discourses on the Yoredale Series, and W. Gunn on 

 the Lower Carboniferous rocks of northern England and Scotland. 



The age of the Wealden, whether Jurassic or Cretaceous, comes 

 •under discussion. The Chloritic Marl and Warminster Greensand 

 are dealt with by Meyer and Jukes-Browne, and interesting notes 

 are given of the Cretaceous fossils from the Drift of Aberdeen. An 

 important paper on the structure of Creechbarrow, in Dorset, is 

 contributed by Hudleston, who shows that this remarkably prominent 

 hill owes its preservation to the occurrence of an Eocene or possibly 

 Oligocene limestone. 



The origin of erratic blocks in the Drift of Yorkshire leads to 

 an amusing correspondence between Howorth and Harker, in part 

 relating to the supposed carrying of stones by the Yikings. Many 

 pages of the Magazine are occupied by Howorth in essays on the 

 Surface Geology of North Europe, on the Scandinavian Ice-sheet, on 

 recent changes of level, and on the Glacial Drifts of Eastern England, 

 the power of water versus ice being dwelt upon ; while Dugald Bell 

 writes on the question of submergence during the Great Ice Age. 

 R. M. Deeley and G. Fletcher deal with the Structure of Glacier 

 Ice, and Mr. E. P. Culverwell contributes an important article on 

 the Theory of the Ice Age. 



The glacial phenomena and denudation of the Skye mountains are 

 dealt with by Harker, who has spent many field-seasons in this 

 grand region. Howorth, writing on the Earliest Traces of Man, 

 rouses up some discussion on Kent's Cavern and Buokland, while 

 Mr. S. H. Warren contributes a suggestive paper on the relative age 

 •of Stone Implements, and the Eev. R. A. BuUen deals with Eoliths. 

 Scharff describes the caves of county Sligo. The subject of Dene- 

 holes comes in for discussion. 



An interesting essay is contributed by H. W. Pearson on 

 Oscillations of Sea-level, and Hoist deals with Oscillations of land 

 during the Glacial period in Scandinavia, In connection with this 

 subject Hull's paper on the Submerged Platform of Western Europe 

 roused up discussion by J. W. Spencer and Jukes-Browne, and led 

 to an important essay by Hudleston on the Eastern Margin of the 

 North Atlantic Basin. 



The determination of the pre-Glacial ago of the raised beach in 

 Gower by R. H. Tiddeman finds interesting support elsewhere in 

 the similar sequence of deposits off Cork Harbour, quite lately 

 described by H. B. Muff and W. B. Wright. 



