120 
THE AVONIAN OF THE AVON GORGE 
on the rock-faces at ‘ Kound Point ’ and it was in cutting this 
Point that most of the ‘ Clifton Corals,’ so common in collec- 
tions, were originally obtained. 
Horizon e. Passage beds from the Carboniferous Lime- 
stone into the Millstone Crit. 
In the Avon section, this horizon consists chiefly of massive 
calcareous grit and is usually included in the ‘ Millstone Grit ’ 
series. 
F a un a : 
Productus scabriculo-costatus (extremely abundant). 
Prod, corrugatus and Orthothetids (common). 
In the repetition of the series, south of the Great Fault, this 
horizon is concealed behind the ‘ General Draper ’ Public House 
and is no longer accessible ; in the main section, north of the 
Fault, the sequence is cut short near the top of D2, before this 
horizon is reached. 
In other parts of the- South-Western Province, the Limestone 
series extends above Horizon e and includes a small portion of the 
subzone D3 which is so important a subdivision of the Lower 
Carboniferous in the Midland and Yoredale Provinces. 
Hence it is impossible to avoid the conclusion that ‘ Millstone 
Grit ’ conditions did not commence at the same time over even 
so small an area as the South-Western Province and that, con- 
sequently, the ‘ Millstone Grit ’ of one locality is the time- 
equivalent of part of the ‘ Carboniferous limestone ’ of another, 
'Millstone Grit.’ 
The massive quartzite -like grits, included under this title, im- 
mediately succeed Horizon e in the Avon section without any 
break, and, since the upper part of D2 contains several bands of 
grit which herald the incoming of prolonged grit conditions, 
we may fairly assume the conformity of the ‘ Millstone Grit ’ with 
the underlying ‘ Carboniferous Limestone ’ in the immediate 
neighbourhood of Bristol. 
