Vice-President’s Address. 22 
bo 
— 
The UprerR CARBONIFEROUS is divisible into— 
(a) CoAL-MEASURES ; 
(>) MILLSTONE GRIT; 
and the LowER CARBONIFEROUS into— 
(c) CARBONIFEROUS LIMESTONE SERIES (Scotland) 
(= Yoredale Rocks of England) ; 
(d@) CALCIFEROUS SANDSTONE SERIES (Scotland) 
(= Mountain Limestone of England). 
The CoaL-MEASURES are further divisible into three 
groups :-— 
UprER CoAL-MEASURES. 
MIDDLE COAL-MEASURES. 
LowER CoAL-MEASURES. 
In addition to these three groups there is a TRANSITION 
SERIES, forming passage-beds between the Upper and 
Middle Coal-Measures. Such Transition Series are quite 
what must be expected, and though there has not yet been 
detected any clearly defined Transition Series lying between 
the other divisions, they may yet be observed. 
The following table shows the main groups into which 
the British Carboniferous Rocks are divisible, as determined 
by their fossil plants, and the correlation of the series in 
Scotland and England. 
