Reviews—Reynolds’s Map of the Environs of London. 525 
VI.—Nerw Mar or tHE Environs or LONDON GEOLOGICALLY 
COLOURED. SCALE 4-INCH To THE MILs.’ 
HIS will prove to be a very useful Geological Map of the London 
area. The high price of the two 1-inch maps of the Geological 
Survey illustrating the same district deters many from possessing 
a reliable map of the complicated geological structure of the London 
Basin. This map issued by Messrs. Reynolds & Sons quite supplies 
the want. The geological lines are correctly laid down, being taken 
and reduced from the larger one-inch Ordnance Geological Map. 
London in both cases is placed in the centre of the sheet [this 
was expressly arranged in the Survey map for the convenience of 
its many inhabitants]. The two maps issued by the Geological 
Survey exhibit two important features over the London area, one 
showing the solid geology and the other the superficial or more 
modern Post-Pliocene accumulations; this is partly done on the 
map before us, but to have placed all the Quaternary sands, gravels, 
and clays (as depicted on the Survey map) on this map (on 
half the scale) would have been at the expense of clearness of 
definition. The superficial area of the map is 2280 square miles 
or 60 miles by 38. London being in the centre, gives a radius of 
30 miles east and west, and 19 miles north and south; concentric 
lines four miles apart denote distance in miles from the centre of 
London. The east and west of the country illustrated extends 
from Long Reach east of Chatham to Laurence Waltham west of 
Maidenhead.  Latitudinally the area extends from Godalming, 
Guildford, and Tunbridge on the south, to St. Albans and Chelmsford 
on the north. The area covered by the one-inch Survey map is 
1144 square miles or 44 by 26 miles; thus Messrs. Reynolds’ map 
contains geological information over 1186 more square miles than 
the Government sheet. The structural or physical lines are care- 
fully laid down over the entire map, the geological epochs shown on 
the map, ranging from the Weald Clay to the Post-Tertiary, or Post- 
Pliocene beds of the Thames Valley, etc., all the railways are well 
defined, a desideratum for scientific as well as ordinary travellers, 
and the stations are prominently marked. 
The colours illustrating the geological formations are numbered 
to correspond with the legend, thus leaving little to be desired as a 
thoroughly convenient map of the Environs of London both topo- 
graphically and geologically constructed. 
Thirty-three pages of letterpress accompany the map, naming and 
‘describing no less than 152 places of interest within the radius of 
30 by 19 miles, being a clear and general history of the more remark- 
able places in the counties of Middlesex, Surrey, and Hssex. On 
p: 15 a short account is given of the geology of the London area, 
tersely explanatory of the varied geological formations that occur 
within the area depicted. We commend this map, published by 
Messrs. Reynolds & Son, to all residents in London and its environs, 
also to travellers and geological students. 
1 Published by James Reynolds & Sons, 174, Strand, 1889. 
