420 Reviews — Geological Survey of Great Britain. 



II. — Summary ok Progress of the Geological Survey of Great 

 Britain and the Museum of Practical Geology for 1910. 

 pp. iv, 87, with 6 text-illustrations. London : printed for 

 H.M. Stationery Office, 1911. Price 1*. 



DUPING the past year the Geological Survey in England and Wales 

 have been engaged in mapping portions of the coal districts 

 of Flintshire, Denbighshire, Warwickshire, and South Staffordshire, 

 and some of the agricultural and residential areas of Berkshire, 

 Buckinghamshire, and Surrey, with the object of completing the 

 six-inch survey of the London district and the south-east of England. 

 In the Welsh district the subdivisions of the Carboniferous rocks 

 have been mapped in detail, and certain red sandstones and marls, 

 formerly grouped as Permian, are now placed with the Upper Coal- 

 measures. A. good deal of fresh information regarding the Glacial 

 drifts and newer deposits has been gathered. In Warwickshire and 

 South Staffordshire new information has been obtained on the structure, 

 the faults, and the upper red barren measures of the coal-fields, and 

 an account is given of bands of calcareous concretions in the Keuper 

 Sandstone that resemble conglomerate and have been so described 

 in the record of a boring. The glacial deposits comprise a Western 

 Drift, composed chiefly of Banter material, and an Eastern Drift, with 

 Chalk flints, etc. 



In the account of work done in the London and South-Eastern 

 district there is a new and important record of a deep boring at 

 Ottershaw Park, which has been carried through Bracklesham Beds to 

 a depth of 1,556 feet, the base of the Gault not having been reached. 

 The details are of great interest, inasmuch as after penetrating 40 feet 

 of ordinary Upper Chalk the bore-hole was carried through 211 feet 

 of Eocene clays and sands mixed with chalk and flints, after which 

 solid chalk was again reached. The disturbed beds seem to have been 

 met with along a nearly vertical fissure. The greywethers and 

 Drift on the Chilttrn Hills are well known. 



In Scotland field-work has been carried on in Mull and South 

 Morvern, in the counties of Sutherland, Perth, and Inverness, and 

 in the central coal-fields. A collection of fossil plants from the 

 Carboniferous rocks, discovered by Professor Judd at Morvern, has 

 been examined by Dr. Kidston, and the species indicate that the strata 

 are of approximately the same age as the productive Coal-measures 

 of Central Scotland. Evidence of Rhsetic beds has been found in 

 Morvern, and some account is given of the Lower Lias and Cretaceous 

 rocks of that region. Good progress has been made in mapping the 

 Tertiary igneous rocks of Mull, and it is observed that the Tertiary 

 coals of the island are of little economic value. In the North and 

 Central Highland district the work has been continued among the 

 metamorphic and associated igneous rocks, including the Lewisian and 

 Moine types, but the relations between these have not yet been 

 definitely established. In the Central Coal-field the revision of the 

 Lower and Upper Carboniferous rocks has been carried on in the 

 districts of Shotts, Fauldhouse, Carluke, East Kilbride, and Douglas. 

 Many new facts are recorded, notably the list of fossils from the 



