THE AVONIAN OF THE AVON GORGE 
87 
II. THE SECTION ON THE CLIFTON SIDE. 
A. Topographical, Lithological, and Structural 
Characters. 
Although there is no exposure south of the entrance to the 
Rocks Railway, we shall, for completeness, commence our 
traverse about 300 yards south of that point. 
If we start from the ‘ General Draper ’ public-house, near the 
end of the Hotwell Road, we are at the junction of the Car- 
boniferous Limestone Series with the Millstone Grit above ; from 
this point, we shall have to cover a distance of a little more 
than IJ miles downstream before we reach the junction of the 
Carboniferous Limestone Series with the Old Red Sandstone 
below. 
Behind the ‘ General Draper ’ there was, formerly, a good 
exposure of the highest level in the Limestone Series (Horizon e) ; 
this level is, however, no longer exposed on either side of the 
Avon. 
The upper subzone (D 2 ) of the Dihunofhyllum-ZonQ (D) is 
fronted by a row of houses and cannot be examined. 
The lower subzone (Di) is, in its higher portion, also concealed 
and lies behind the ‘ Colonnade ’ ; its lower portion is, however, 
well exposed in the lofty vertical-face of rock which includes the 
entrance to the ‘ Rocks Railway ’ and the ‘ Hot Well.’ The Dj 
subzone extends northward to a point a little beyond the steps 
at the bottom of the ‘ Old Zig-zag ’ (a steep path which winds 
up the side of the gorge). 
Between the ‘ General Draper ’ and this point, the whole of 
the Dibunoyhyllum-Zone is comprised. 
enter the Seminula-Zone and the section 
Plate XI. . 1 • 1 p 
rises to a height of more than 200 feet above us ; 
we proceed under the Suspension Bridge and past the Hotwell 
Station, which lies at the foot of Observatory Hill, until we 
reach a fork in the road at the end of the Station wall. Follow- 
ing the upper branch (Bridge Valley Road) for a short distance. 
