1 | 
368 Mr. Farey’s Notes on Mr. Bakewell’s Geology. 
P. 141. sionally wrought (Rep. i. 212), under a very coarse 
(and I believe an accidental) thick Gritstone bed, 
in the Ist Coal Shale; which circumstance escaped 
my notice, until my Ashover Survey, wherein I 
found, other occurrences of a coarse Grit bed, in 
za the same part of this 1st Coal Shale. 
142, |. 21 and 22, no connection with any other*.—* If 
by this expression is meant that the surfaces or 
basset edges of Coal-strata, cannot now be traced 
in connection on the surface between one Coal- 
field and another, it is perfectly correct: but if it 
is meant thereby to contend (and by nearly similar 
expressions in pages 134, 268, 273, &c.) that a 
connection did not once exist, between several 
Coal-fields, now separated, I must beg to dissent, 
and maintain, that before the dislocations of the 
strata happened, which threw up (comparatively 
at least) great thicknesses of strata, that have since 
been denudated and are gone, from off the interven- 
ing spaces ; or which threw down (comparatively) 
the large intervening tracts of strata, so that not . 
only the Coal-seams themselves, but the whole of 
the Coal-series are sunk, below practicable mining 
depths, and are consequently unknown, that se- 
veral of the Coal-fields did then connect ;. the 
succession of the strata that do exist on the sur- | 
face, between and around these Coal-fields, will 
] think prove it, as well as the successions or | 
sinkings, in the Coal-measures themselves, when 
due allowances are made, for those variations in 
thickness and quality, in the individual strata, 
which so frequently happen, within each Coal- 
field, of any considerable extent. 
Mr. Edward Martin, Coal-Engineer of Morris- 
town near Swansea, in South Wales, was brought 
up and first practised his profession in the Whites 
haven Coal-field, in Cumberland, and is perfectly 
acquainted with the strata of each of these very 
distant Fields. When this gentleman was in Town 
in April 1806, and had drawn up thé Paper which 
appeared in the Phil. Trans. 1806, p. 342, (see 
also Williams’s Min. Kin. 2d Ed. ii. 291) describ- 
ing the South-Wales Coal-basin, I had a great deal 
of interesting conversation with him on the sub- 
ject, in which he stated, and mentioned numerous 
facts in confirmation of his opinion, that the Coal- 
fields’ 
