Subdivisions of the Paleozoic Strata of Great Britain. 345 
dower Paleozoic Division as developed in the Cumbrian moun- 
tains of the North of England. 
fA Sle of vast bacon po probably admitting of 
several subdivisions. In some o whe upper beds 
i 1; poi dnte beg alites and fuoids ound, 7 
(Lower Cumbrian) dally u “Of fi ssils, Near the 
mee ‘ar Sk riddere Forest. entry metamorphic. 
It is the ota ogee mh - the Longmynd 
slate (1 a) of, the Cambrian s 
pA ee up of enormous Na ee sed of alter- 
ew masses of slate, sandstone, porphyry, por- 
ee ae ic oe a te, trap-shale, cc. ce. = wore 
0 passag the Skiddaw slate, and i 
tists separated. Sine it by trappean Conglomerates. 
The con s become attenu d pass 
2. re into tra Caled shale) ae the shales pass 
— — ane into roo oan: sla The alter ns are re Mee 
: - le. The great deposits of ina are good minera 
— Cumbrian) equivalents of the antes Festiniog slates. 
oup seems to pass, at one extremity, into the 
bor ae slates of the Gonis pa group; and (when 
taken collectively) may be pws ered as the equiv- 
alent of all that part of the Cambrian series which 
‘anes an ne ig angor slates to 
the cae an, rite: inclusive. 
8. Coniston group a, Coniston and calcareous slate. 
. (Upper i b. Piaatees, eenaiiy calcareous.* 
A, 
Equivalents of the Cambrian Series. 
= 
The Coniston limestone appears to be the exact equivalent of 
the Bala limestone both in its mineral type and in its group of 
fo ssils; and the Coniston flagstone seems to represent (in a very 
egenerate form) the slate, flags, grits, shelly sandstones, and 
coarse conglomerates which in North and South Wales overlie 
the Bala liinestins and the Llandeilo calcareous flagstone. 
the Coniston teerus and fi e were confounded with the Caradoc sa 
an Wenlock shale, the Coniston one aypes to be quite anomalous amon 
“urian groups: but now that these grits have found their right place, the somal 
the i 
n 
country of the North o land ; and spite of their general sterility, 
bak make a nobl de ectaean ition of the » May Hill sandstone, and thus form the na tural 
of the erie series of the Cumbrian mounta ad 
€ never was any real iia in hae gatarst succession of the physiea 
Soups of Cum berland and Wi pareinnd and I could have described this succes- 
ao, in 1824, as well as, per aod hous ie ie given in this Tabular View. The 
ondiasasoauent difficulty was in sttendpeing to A owe the successive groups into co- 
he; with those of Wales and Siluria; and so long as the sections;-the fossil 
tasion en tomenelature of the “ Lower Silurian socks were taken as a Key, the 
fonfusion among th apts was oan: simply because the key was fa 
ae But the moment the so-called “Silurian key” was rown asid 
limestone naturally fell into the place I had first given to it. It became the 
*quivalent of the Bala limestone : ; nd th who i ease 
Perfectly na natural, both on physical and | paleontological gr ounds, 
Secon Sznms, Vol. XXI, No, 68—May, 1856. 44 
