THE LOWER LIAS OF KEYNSHAM. 
29 
with Am. geoinetricus., but all the specimens found at this 
horizon are crushed and poorly preserved. 
The most characteristic fossil of the beds immediately 
above the Geometricus horizon is Bel. acictuSy which here 
attains its maximum ; satisfactory specimens can be picked 
out of the shales. 
Oxynotus Zone. 
Above the Arietes zone is a thick, unfossiliferous clay 
containing horizontal roAvs of large limestone nodules. These 
are the highest beds encountered in any of the exposures. 
Notes on Exposures 1, 2, 3, 4, 5. 
The position of all the exposures is sufficiently clearly 
shown in the map. 
Exposure 1. A quarry in work. 
In the south-east corner is a fine and complete section of 
the Angulatus beds which shows this series resting upon the 
thick clay and capped by the thick top block of the Calci- 
costa series. 
The east wall of the quarry, nearer the road, shows the 
Bisulcatus division of the Arietes zone very clearly, and 
numerous large ammonites can be seen in situ. 
The south wall of the quarry exhibits several small flexures, 
of which one is a well-marked anticlinal fold in the Angula- 
tus beds, and two others are monoclinic flexures or incipient 
faults. 
Fossils can be picked up more abundantly in this quarry 
than in any other ; they are chiefly derived from the Angula- 
tus beds {Wald. perforata., 0. irregularis, Pleuromya (casts), 
fragments of Am. angulatus, and Lima hettangiensis are 
amongst the certain finds). 
Exposure 2. A disused quarry. 
The only interest of this exposure is the well-marked fault. 
