NORWEGIAN SUCCESSION. — LOWER SILURIAN TO OLD RED SANDSTONE. 12* 
Lower Silurian rocks of Norway have very little of the arenaceous character which 
the same group assumes in certain tracts of Britain, but are most analogous to the 
schists and calcareous flags ot Llandeilo, where those masses have not assumed a 
slaty structure. This lower division is overlaid by shales and massive coralline 
imestones containing many of the typical species of the Wenlock limestone in the 
ritish Isles, and these again by calcareous flagstones and schists which from their 
fossils and position may be taken to represent the Ludlow rocks. 
Though packed into a narrow band of no great vertical dimensions, the Silu- 
nan strata of Norway are thus clearly divisible into an upper and lower group, 
lese groups are further separated from each other by a limestone loaded with 
entcimerus oblongus, which fossil, occupying exactly the same place in the Wool- 
iope or Horderley limestone of the British Isles, and lying between the two, may 
. mS ’ accordin g to the natural features and prevailing fossils of each country, be 
classed either as the base of the Upper Silurian rocks or as the uppermost bed of 
the Lower. The Upper Silurian group is distinguished by the Catenipora escha- 
r aides, C. labyrmthica, and many other typical species of corals, as well as by a 
multitude of shells, among which are many which occur in rocks of the same age, 
both in the British Isles and in the Isle of Gothland. 
In truth, no English geologist acquainted with the organic contents of the Wen- 
lock limestone can view the little isles of Malmoe Oen and Malmoe Kalv in the 
ay O Christiania (which we examined in company with M. Leopold Von Buch'), 
an see in them the Calymene Blumenbachii, C. macrophthalma, C. variolaris, and 
0 er rilobites associated with the Ltptama depressa, L. euglypha, Terebratula reti- 
and many corals most familiar to him, without at once recognising in the 
upper strata the distinct representative of that British formation 3 . 
1 r J T L* ♦ 
* W " eminerd geologist was, like ourselves, at the Christiania meeting of Scandinavian savants of 1844 . 
and B ^ -° ^ ^ corals ancl she l ls which are common to the Upper Silurian of Norway 
of th beCaUSe tbe Got!lland list > afterwards given, may be taken as the best sample of the identity 
U ormations in Britain and Scandinavia. We cannot, however, avoid noting, that besides the usual 
proy 61 llumn kraelnopods, we procured from M. Keilhau a specimen of the Nucula cingulata (His.), which 
8o \ v eS h t0 1)0 iden tical with a shell which we had long ago obtained from Dudley, but which Mr. James 
our'fo 7 ’ Unable P erfectl y satisfy his mind concerning its relations, had refrained from describing in 
Dudl ° r 7 WOrk on the Silurian System. It is further worthy of remark, that this shell, so rare at 
Phillip ■ iaS IMently been discovered P rett y plentifully by Mr. Sharpe, Professor Sedgwick and Professor 
depressa the Upper Silurian rocks of Westmoreland, near Kendal, and is there associated with Leptana 
gkal &C ‘ We thUS SeS the ValUe ° f n0t omittin S considerations of minute pal*ontolo- 
another ^ & Shdl extremel y rare in onc region may thus become a type of the same epoch in 
