expi.anation ot plate 67 . 
105 
resulting from these Interruptions of the continuity 
of the strata are pointed out in pp. 643, 544, 
A large portion of the surface of these strata 
near Newcastle is covered with a thick bed of 
diluvial Clay interspersed with Pebbles, in the 
manner represented at the top of this Section. The 
effect of this Clay must be to exclude much rain- 
water that would have percolated downwards into 
the Coal mines, had strata of porous Sandstone 
formed the actual surface. 
Plate 67, V. I. p. 559. 
1. lepresents the case of a valley of Denudation in 
stratified rocks, terminated abruptly by a cliff on 
‘-opies of his most important plans and sections, accompanied by 
’''ntten documents, of the under ground workings in the Collieries 
that town, in which all those spaces arc carefully noted, from 
.^lence the Coal has been extracted. Every practical Miner is too 
cons danger of approaching ancient workings in 
^Jisequence of the accumulation of water in those parts from which 
mii^ been removed. The sudden irruption of this water into a 
c uie adjacent to such reservoirs is occasionally attended with most 
anutous and fatal results. See History of Fossil Fuel, tlie Col- 
ettes and Coal Trade, 1835. P. 249 et seq. 
tioi ‘^*®bites of humanity which prompt us to aid in the preserva- 
av'*p ^*''*^*'"* *ban the economical view of rendering 
Co^l ^abire time the residuary portions of our beds of 
ind^ ’ extracting them, should 
an proprietors and other jjersons connected with Coal Mines, 
sor bingineers and Coal Viewers, to leave to their succes- 
and* ’ which will to them be precious, by preserving minute 
jj g ^aet records of the state of the coal in their respective districts. 
scarcely be expected, that such measures uill be 
jjgj ^'*4 systematical!}' adopted throughout the many Coal 
th * *bis country, unless the subject be legislatively taken up by 
welf^ persons, whom it behoves, as guardians of the future 
*be nation, to institute due measures, whilst the opportu- 
littlT that loss of life and property, which a 
® attention bestowed in season, will preserve to posterity. 
