STKAT1GRAPHICAL SERIES. 
153 
of Brent Tor. The Old Bed Sandstone of Scotland and its 
associated volcanic rocks also find tlieir place in this series. 
The long range of Cases on the eastern side of the doorway 
(Nos. 22 to 30 ) is devoted to the Carboniferous system. The 
Carboniferous Limestone series naturally claims a large space ; 
but a still ampler allowance is allotted to the Coal-measures. 
The arrangement is here topographical, each coal-field being fairly 
represented. Occasionally a specimen will be found displaying a 
typical fossil, but it should be borne m mind that it is not the 
object of this part of the Museum to illustrate the organic 
remains which occur in the stratified rocks, and the representa- 
tives of the coal -flora should consequently be sought in the 
pakeontological collection. A fine series of specimens illus- 
trating the calciferous sandstone series of Scotland and the 
volcanic rocks in the Carboniferous system of Northern Britain 
will be found in the cases now under description. No space is 
available in the Wall Cases for the illustration of formations 
above the carboniferous system, and the remainder of the 
stratigraphical eoliection has consequently to be accommodated 
in the four large Pedestal Cases, which are conspicuous objects in 
the Central Area of the Room. Illustrative geological sections, 
drawn and coloured by hand, are suspended in the upper part of 
each Pedestal Case, to assist the student in realising the mode of 
occurrence of the rocks which are represented by specimens in 
the lower part of the Case. 
From the Carboniferous formation, which terminates in Wall- 
Case No. 30 , we pass to illustrations of the Permian system in 
the opposite Pedestal Case, numbered in Sections, 31 to 40. Here 
we note not only the red sandstones and marls but the dolomite, 
or magnesian limestone ; and the eye is arrested by the con- 
cretionary forms assumed by some of the calcite in the 
dolomitic series of the north of England. The volcanic series of 
presumably Permian age found in Ayrshire and Devonshire is 
illustrated in this Case. The Triassic group is well represented— 
the lower or Bunter division by its variegated sandstones, and 
the upper or Keuper division by its sandstones and marls. Rock- 
salt and gypsum are exhibited as characteristic minerals of the 
New Red Marl. The Rhcstic beds — so named from their typical 
development in the Rhaetic Alps — form a connecting link 
between the Trias and the Lias, and are here represented by 
several specimens, including the curious “ Landscape Marble ” of 
Bristol. The Lias makes a great show in this Case, some of the 
specimens being rich in ammonites, belemnites and other 
characteristic fossils. Here, too, we note the limestones of the 
Lower Lias, so valuable as cement- stones ; the ironstones of the 
Marlstone, or Middle Lias, extensively worked in the Cleveland 
district ; and the shales of the Upper Lias, forming the matrix 
of the Whitby jet, and formerly worked for the manufacture of 
alum. 
e 87039. L 
