DEPOSITED IN WATER. 
11 
the relation in this respect of other parts of England, Scotland, and 
Ireland. 
j Derbyshire , North and 
North of England, and Scotland. South Wales. 
coal forma- f Coal, shale, grits, and Coal, shale, grits, and 
TION | : 
Transition series 
ies 1 
L 
CARBONIFEROUS « 
LIMESTONE 
SERIES 
Transition series f 
OLD RED | 
FORMATION ^ 
ironstone 
Millstone grit 
(cOAI.) 
Shale. 
Upper series. 
Limestone 
Gritstone 
Shale 
(coal) 
Lower series of lime- 
stones 
(coal) 
ironstone. 
Millstone grit, or Fare- 
well rock. 
‘ Limestone shale,’ 
( Derbyshire.) 
Belgium, and South 
of England. 
Coal, shales, 
grits, and iron- 
stone. 
Mountain limestone 
( England. J 
Alternations of red Alternations of red sand- 
sandstone § limestone stone and limestone 
l 
Red sandstones and 
red conglomerate 
Red sandstones and 
conglomerates 
Limestones and 
shales 
Alternations of red 
sandstone and 
lime stone 
Red conglomerate 
Ireland. 
Coal, shales, 
grits, & ironstone 
Kulkeagh grit 
Kulkeagh shale 
Kulkeagh lime- 
stone 
Loch Earn shales 
and grits 
Enniskillen lime- 
stone 
Alternating red 
grits and lime- 
stones 
Red sandstone 
and conglomerate 
It is necessary, for the sake of a careful comparison between one 
country and another, to divide the larger groups of associated strata 
into convenient assemblages or series ; but in doing this we must be 
ever mindful that our lines of division contain much that is arbitrary 
and more that is merely of local application. The carboniferous system 
undoubtedly does permit itself, in almost all situations, to be considered 
in three series, characterized by the prevalence of coal, limestone and 
which n anT e fj ^ C T7-° ndi L g t0 S ° me gGneraI Phy" conditions 
lilies^ rTf 7 , preV “ led J the re S lons wher e this classification ap- 
onlv n l, draw hard lines of division between these groups is 
contimfif V n ^ ^ Where ge0l ° gical acciden *• have broken the 
arisinJ 7 ^ operations; for where on such accidents (whether 
erouns n • ° r distant convulsi ons) have occurred, the three 
or repeated T° °™ ^ gradUal a PP roxi matkm of character, 
of coal series anf 1 ™ ° f de P°^ ts - Somersetshire the distinction 
i. • and mountain limestone series is absolute- but in 
Y ° rksh,re “ d North of England, the two groups are c0 ‘ . 
C 2 
