BRITISH ISLES. 41 



Traill, W. A. On Geological Sections in the Co. Down. Rep, Brit. 



Assoc, for 1874, Sections, pp. 93-95. 

 Describes the results of the Geological Survey of the district as shown 

 on the published Maps and Sections. The larger part of the county is 

 formed of Lower Silurian beds with interbeddcd igneous rocks. These 

 were contorted and intersected by dykes of melaphyre, dolerite, and 

 diabase, the sources and " necks " of which still exist in the S. of the 

 county. The granite of Slieve Croob is probably Palaeozoic. Only 

 small patches of Carboniferous Limestone now remain. Of Permian 

 beds the traces are still smaller; these rest un conformably on the 

 Limestone or on L. Silurian. Subsequently to this period occurred the 

 eruption of the Mourne granite. Of still later age are two sets of 

 igneous rocks : the quartziferous porphyries and felstones of Slieve 

 Meelmore and Slieve Bearnagh, and the basaltic dykes supposed to be 

 Tertiary. The basalt of Scrabo Hill is possibly an outlier of the Antrim 

 plateau, or it may be a separate neck. The trap penetrates the New 

 Ked in sheets and dykes. Under the New Red is Carboniferous Lime- 

 stone. The author discusses the question of the occurrence of Coal, and 

 believes that none will be found, but that the New Red lies directly on 

 L. Silurian in the areas where the Coal has been looked for. W. T. 



Tylden-Wright, C. The Geology of Sherwood Forest and the Dis- 

 trict. Chapter XYI. of R. White's WorJcsop, " The Diol-ery," and 

 IShenrood Forest. 8vo. London and Worksop, pp. 283-292, plate. 

 The formations range from Keuper to L. Coal Measures, the JBunter 

 (conglomerate and pebble-beds) taking up the largest area. The Plate 

 is a " Geological Section of the District of Worksop :" horizontal scale 

 an inch to a mile ; vertical, an inch to 300 yards. W. W. 



Ussher, W. A. E. On the Subdivisions of the Triassic Rocks 

 between the Coast of West Somerset and the South Coast of Devon. 

 Geol. Macj. dec. 2, vol. ii. pp. 163-108. 



The subdivisions are, in descending order: — 1. Upper Marls, 1000 

 feet, with veins of gypsum and pseudomorphs of rock-salt. 2. Upper 

 Sandstones, 460 feet ; very variable in composition ; at about 50 feet 

 from their base are the conglomerates of Otterton Point. 3. Pebble 

 Beds and Conglomerates, with beds of sand and sandstone, 60 to 100 

 feet. 4. Lower Marls, with beds of sandstone, 460 feet. 5. Lower 

 Sandstones and Breccias, 1000 feet or less ; the most variable member 

 of the series. The beds are much faulted, and estimates of thickness 

 based on observed dips and breadth of outcrop are conjectural; in 

 place of the miles of thickness which liave been assigned to this forma- 

 tion, it is probable that the total is under 3000 feet. 'W\ T. 



Vincent, W. T. Warlike Woolwich : a History and Guide. Svo. 



Woolwich and London. Pp. vi, 137. 

 Notes on the Geology by Wells and Freeman, pp. 126, 127 ; on the 

 old forest in tbe bed of the Thames, p. 67. 



Walker, H. Excursion to St. Mary's Cray, Well Hill, and Shore- 

 ham, Kent. Proc. Oeol. Assoc, vol. iv. no. 3, pp. 155-157. 



