374 Reviews — Geological Survey, Great Britain. 



In the Warwickshire and Stafiordshire district the mapping of the 

 Etruria, Halesowen, and Xeele groups has been continued south of 

 Nuneaton, and a thin band of Spirorhis limestone kno^vn as the Index 

 Bed, which occurs about 150 feet below the top of the Halesowen 

 group, has been traced for a considerable distance. Above the 

 Halesowen group there are upwards of 2,500 feet of sandstones with 

 conglomerates and marls, and there is as yet no evidence to show 

 whether any part of them can be assigned to the Permian. The 

 Arden Sandstone group in the Keuper Marl has been traced for some 

 distance, and the relation of the North Sea and Irish Sea drifts has 

 been further investigated. 



In the London and south-east district the surveying of the Chalk has 

 progressed on both sides of the Thames, and the fauna of the horizon 

 of Heteroceras retissianum has been proved to have a wide extent. 

 The drifts and Tertiary beds have received much attention, and further 

 light has been thrown, by the mapping, on the faults and folds which 

 affect the strata underlying London. 



In Scotland work has been carried on in the Highlands, principally 

 in the counties of Sutherland, Eoss, and Argyll. Further evidence 

 of the former extension of the Middle Old lied Sandstone over the 

 Northern Highlands has been obtained by the discovery of a con- 

 siderable area of conglomerate and red grits 2 miles south of Loch 

 Gaineamhach in Sutherlandshire. In North- Western Ayrshire the 

 new base-line that has been adopted for the Lower Carboniferous is 

 drawn above a series of reddish sandstones that are relegated to the 

 Upper Old Eed Sandstone, and revision of the original survey of the 

 Carboniferous districts has also proceeded in the Paisley district and 

 around Hamilton in Lanarkshire. It has proved possible to correlate 

 the results of the geological mapping of the Carboniferous Limestone 

 areas in Lanarkshire, Renfrewshire, and Ayrshire. Small patches of 

 Jurassic rocks, in addition to those previously recorded, have been 

 found in several places underlying the Tertiary lavas of Mull. It 

 has been decided to make a more detailed investigation of the 

 palseontological zones of the island of Raasay on account of the 

 importance of the iron-ore deposits of that island. Here and in Skye 

 an extensive deposit of oil-shale has been found which may prove to 

 be of considerable economic importance. The mapping of the interior 

 of Mull has been continued and has yielded interesting results. 



During the year important petrographical and palseontological work 

 has been carried out in connexion with the field-work in both England 

 and Scotland. 



Lists of additions to the museum and library are given. In the 

 museum temporary exhibits have been arranged to illustrate the 

 memoir on the geology of the Lizard district and the types of flint 

 implements found at Swanscombe, Kent. There is also a list of maps 

 and memoirs issued during the year. There are three appeiuiices : 

 (1) On the Heswall Boring, by Dr. Strahan ; (2) On a Boring for 

 Coal at Hemington, Somerset, by T. C. Cantrill and J. Pringle ; and 

 (3) Additional Notes on the Geology of the Lothian Shale-field, by 

 R. G. Carruthers. 



