476 Correspondence — R. M. Beehy, F.G.8. 



in the south-east of Ireland. Vigorous efforts have been made 

 determine the relative ages of the great groups of grits and slates 

 in Devonshire and Cornwall. Important details are given of the 

 work done in the Coalfields of North Staffordshire and South Wales. 

 The discovery of Rhsetic fossils in the island of Arran is of great 

 interest, although it appears that the specimens were not found 

 actually in sM, but enclosed in a coarse conglomerate that fills 

 a volcanic vent, probably of Tertiary age. Other fossils, of Ehaetic 

 aspect, have been found in Skye, and some interesting records are 

 given of the strata in South Wales, where evidence has been 

 noticed of the local recurrence in Ehgetic beds of the sedimentary 

 conditions which attended the deposition of the Keuper Marls. 



Brief references are given to work in Jurassic and Cretaceous 

 areas, and a list of fossils from the Sandgate beds near Midhurst is 

 worthy of mention. 



The further work on the Tertiary igneous rocks of Skye leads to 

 the belief that the great gabbro laccolite has a maximum thickness 

 of about 3,000 feet or more. The survey of the Cuillin Hills has 

 been nearly completed. The detailed study of the western part of 

 the range shows the great complexity of its structure, and the very 

 considerable part played by portions of the basaltic lavas entangled 

 in the gabbro and highly metamorphosed. The gabbro itself consists 

 of numerous distinct intrusions in the form of wedges, sheets, and 

 tongues. 



Many interesting facts relating to the Glacial Drifts and newer 

 deposits have been gathered. Especially noteworthj'- is the con- 

 clusion that the raised beach of the Gower promontory in South 

 Wales, between Bacon Hole and Mumbles Head, is pre-Glacial or 

 Interglacial. The bone-beds which rest upon the raised beach in 

 the caves are continuous with a layer of ' head ' which overlies the 

 beach. Glacial Drift lies upon these deposits. 



Eecords of the petrographical and palteontological work and lists 

 of publications are given at the end of this " Summary of Progress," 

 which displays throughout the evidence of much painstaking and 

 enthusiastic labour. 



n 



FINE SECTION OF BOULDER-CLAY AT CRICH. 



Sir,— Geologists interested in the glacial deposits of the Midland 

 Counties will no doubt be glad to hear that a very fine section of 

 Boulder-clay, which rests upon a striated floor of Mountain Limestone, 

 is now to be seen in Derbyshire near the village of Crich (Matlock 

 Baths). The presence near this place of a great mass of Boulder-clay 

 containing erratics foreign to the county has been known for a number 

 of years. Recently the quarry cutting into this clay has been re- 

 worked, a steam navvy having been set to work to clear the clay off 

 the limestone. Mr. Arnold-Bemrose and I visited the quarry on 

 November 25, 1899, and found that an excellent section of 'till' 



