Revieics — The Geological Survey. 41 



their connection with the Lorne volcanic region, where the volcanic 

 vents are of Lower Old Red Sandstone age. The granites are those 

 of Ben Cruachan, Blackmount, and the Moor of Rannoch. 



Work has been carried on in the Coalfields of South Wales and 

 North Staffordshire. Attention has been recalled to the Gower 

 Series near Swansea, Lower Carboniferous strata which lie above 

 the massive Carboniferous Limestone. They had been compared 

 with the Coddon Hill Beds of North Devon by De la Beche, and 

 recent investigation has confirmed the correlation. Moreover, 

 Eadiolaria have been identified in the South Wales chert by 

 Dr. G. J. Hinde. A somewhat similar group of strata has been 

 observed along the northern side of the Coal-basin in Carmarthenshire. 



Some of the detailed results of the Survey work in the Coal- 

 measures near Swansea are given, and attention is drawn to the 

 positions of the principal seams of coal and to the faults and dis- 

 turbances by which they are affected. 



Comparisons are made between the succession of Coal-measures 

 in North Staffordshire and that in Denbighshire, the stratigraphical 

 divisions being found to be so nearly identical that evidently the 

 same conditions were prevalent in both districts at the close of 

 the Carboniferous Period. A very similar succession, moreover, can 

 be made out on the northern flanks of the Clent Hills between 

 St. Kenelms and Old Hill. 



There are notes on the granite of Cornwall, and evidence is given 

 for concluding that not only is there a close connection between the 

 major joints and the grain of the rock, but that this grain is 

 dependent on the internal mineral arrangement of the granite, all 

 three phenomena being closely related. This is noticed in the 

 orientation of the felspars, of which the long axes lie parallel to 

 the cleaving- way joints. 



There are short accounts of Triassic and Jurassic strata in the 

 midland counties of England and in Skye. More attention is given 

 to Cretaceous rocks, and comparisons are made between the divisions 

 of the Lower Greensand in West Sussex and in the Isle of Wight. 

 The occurrence of masses of white limestone and chert with Chalk 

 fossils, in a large volcanic vent in the Isle of Arran, is recorded, 

 and further particulars are given of the interesting discovery therein 

 of fragmentary portions of RhEetic and Liassic strata. These 

 researches have not only thrown new light on the former extension 

 of the Secondary strata over the south of Scotland, but they also 

 afford evidence of the Tertiary age of the great series of younger 

 igneous rocks in Arran. 



Further information is given on the Tertiary volcanic series in 

 Skye and on dykes in Western Argyllshire. 



Reference is made to the overlap of the Bagshot Beds on to the 

 Chalk in the western part of the Hampshire Basin, and attention 

 is called also to the overlap of the London Clay, which in places 

 cuts through the Reading Beds and rests on Chalk. The occurrence 

 is noted of small quantities of nickel and cobalt in the Reading Beds 

 at Cadmore End Common, near High Wycombe. 



