162 
WILLIAM SMITH : HIS MAPS AND MEMOIRS 
e Oaktree Clay, a tenacious Woodland Soil a bituminous part in 
the Isle of Purheck used for fuel | I 
f Sand and Stone, extensively overlayed in Yorks., Oxfords., 
Berks., Wilts., and Dorset, by the Coral Rag and its cal- 
careous Freestone | | 
q Clunch Clay and Shale, along its course have been several 
unsuccessful Trials for Coal, — on the northern part are 
extensive Allum Works | | 
h Upper Oolite, or Bath Freestone Rock, overlayed by Corn- 
brash, Sand, and Forest Marble, coloured ... \ | 
i Under Oolite separated from the upper by Fuller's Earth 
and its Rock. It is a coarse calcareous Freestone | I 
k Blue Marl and Lias Limestone, the very thick superincumbent 
Marl is represented by the lighter Blue — The White Lias is 
used for Lithography j I 
I Red Marl containing beds of soft red Sa^idstone and occasionally 
of blue Clay — The Salt Works of Cheshire are in this stratum 
In the environs of Bath, Coal is worked beneath the Red 
Marl I I 
m Redland Limestone, overlaying the Coal measures, much cele- 
brated in Yorkshire for extensive Lime-works ••• | I 
n Coal Districts with the Rocks and Clays accompanying the 
coal comprising the great Iron-works | | 
0 Mountain Limestone, alternating with beds of Shale, Chert 
a7id Gritstone and containing numerous Veins of Lead and 
Copper I I 
p Trap Rocks [ [ 
q Red Rhab and Dunstone, with inter spersions of Lime- 
stone ... ... ... ... ... ... I I 
r KiLLAS OR Slate, and other Mountain Strata, abounding 
ivith Minerals ... ... ... ... ... ^| 
s Granite, Sienite (sic), etc | | 
In the space occupied by the North Sea are two Tables, viz., " A 
List of the Canals & Navigable Rivers shewing the principal 
articles of Mineral Tonnage," and Railways." The former 
