THE CARBONIFEROUS LIMESTONE OP BURRINGTON COMBE 15 
Sequence in the Carboniferous Limestone of the Bristol 
Area,” read before the Geological Society on June 8, 1904, 
Dr. Arthur Vaughan, B.A., D.Sc., F.G.S., has suggested 
a system of palaeontological zones for the Carboniferous 
Limestone of the Bristol Area, based entirely on the 
sequence of corals and brachiopods. In this paper Dr. 
Vaughan gives a brief list of the main features of the 
Burrington sequence for comparison with the Bristol 
sequence. 
I am at present engaged on the examination of the 
Carboniferous Limestone of the whole Mendip Area, with 
a view to establishing a zonal system for this development. 
The lines which I am following in this investigation are 
essentially similar to those followed by Dr. Vaughan in 
his examination of the Bristol Area. 
Such an undertaking is best commenced by an examina- 
tion of the best section to be found in the area : this section 
may then form a basis for correlation during the subse- 
quent work. 
Burrington Combe affords the most complete section 
to be found in the Mendips, the total thickness of Car- 
boniferous Limestone exposed being about 2,600 feet ; 
this series extends from the top of the Old Red Sandstone 
into the Lower Dibunophyllum Zone, and is thicker than 
the whole Carboniferous Limestone series as displayed 
in the Avon Gorge. The top beds of the Carboniferous 
Limestone are, at Burrington, covered up by Triassic 
deposits. 
The present paper contains the results of a detailed 
examination of this section. This examination has de- 
monstrated beyond doubt that the faunal sequence at 
Burrington is, on the whole, remarkably close to that 
in the Bristol Area. Accordingly, the greater part of the 
zonal system adopted by Dr. Vaughan for the'^' Bristol 
sequence has been adhered to in this paper ; alterations 
