178 —— Reviews—New Survey Drift-Maps. 
south-east corner, Wellington 4 miles from the north-west corner. 
The original one inch Geological Survey map, Sheet 21, was 
published probably in 1833. The area was resurveyed on the one 
inch Old Series map between 1870 and 1876, and the geology was 
transferred to the New Series map, with additions by Mr. A. J. Jukes- 
Browne, in 1892. The colour-printed edition is dated 1906. The 
principal additions to the map, which includes the famous Greensand 
area of the Blackdown Hills, are in the subdivisions of the New Red 
rocks and the insertion of the Rheetic Beds and superficial deposits. 
A section below the map shows the structure of the country along 
a line from north-west to south-east from Kittistord (near Wellington) 
through Church Stanton to ‘'atworth (near Chard). 
The memoir explanatory of the map is entitled Explanation of 
Sheet 311: ‘‘The Geology of the Country between Wellington and 
Chard,” by W. A. EK. Ussher, F.G.S. 1906, pp. vi-+ 68, with 
11 figures, price 1s. 3d. The strata described include a very small area 
of Devonian (Pilton Beds) and Lower Culm Measures, a large area of 
New Red Sandstone with a narrow outcrop of Rhetic, a large spread 
of Lias and Cretaceous, the latter largely covered by Plateau deposits 
(Clay with Flints, etc.). Between the five members of the New Red 
Series no signs of discordance have been found. The Lower Sandstone 
and Breccia (Permian) exhibit a passage series into the overlying 
Lower Marls north of the Tone Valley, comparable to that in the 
South Devon coast section, but which has not been detected in the 
intervening area. The Pebble Beds show a passage of unconsolidated 
pebbly sands into hard conglomerate in the vicinity of Thorn 
St. Margaret. A chapter is devoted to Economic Geology. In an 
appendix a list (of thirty items) includes the titles of the principal 
works on the geology of the district, and four complete pages are 
devoted to an index. B. Hoxson. 
IlJ.—New Gerotoercat Survey Drirr-Maps, Ere. 
{T\HE Geological Survey are issuing a Drift edition of the 4 miles to 
1 inch Map of England and Wales. The sheets published (dated 
1906) are No. 8, comprising the East Coast of England from Filey 
Bay to Saltfleet in Lincolnshire (most of the map represents the North 
Sea), and No. 12 (the sheet immediately to south of No. 8), comprising 
a large part of Lincolnshire, the Wash, and Norfolk (Lowestoft North 
station and Peterborough being included). The superficial deposits 
shown include, under ‘ Drift,’’ loam, sand and gravel, boulder-clay ; 
and under ‘‘ Recent and Post-Glacial,” valley gravel, loam, alluvium, 
and blown sand. ; 
As compared with the Solid Geology edition, these maps show 
several improvements—the railway stations are marked, many altitudes 
are given, more topographical detail is shown, and it is brought more 
nearly up to date; the colour-printing is excellent. There is only 
one point that the purchaser is likely to find fault with, and that 
is the price of the maps. The sheets only measure 15 inches by 
224 inches over the topographical work, whereas the Solid Geology 
