330 
Conglomerate, consist of finely grained thin flagstones of white 
and whitish grey colour, this upper division being underlaid by 
coarse quartzose Conglomerate and Red Sandstone. Sections 
made in different parts of the district exhibiting the same suc- 
cession and persistency of the Conglomerate in the centre, and 
even lower part of the formation, (‘‘ Siluria,” p. 453.) 
After this general description of the strata met with in 
succession and their approximate thickness, it may be of interest 
to bring out some of the characteristic features of the section 
into greater prominence. Beginning with the quarry at the 
S.E. end, we first come upon a series of limestones divided by 
shaly partings, with numerous flattened Producti and Corals. 
About 50 feet from the surface come three (No. 12) compact 
beds of limestone about 7 feet thick, with the dip face of the 
topmost bed perfectly covered with Brachiopods and univalves. 
Being very imperfect and merely casts, it was difficult to make 
out what they are. Some 8 feet lower down a reddish brown 
coloured dip face (No. 17) attracts attention at once; it pre- 
sents a hummocky uneven surface, and is streaked with veins 
and strings of calc spar sometimes coloured red in the centre. 
The quarrymen find this mass very difficult to work owing to its 
dense siliceous nature, and give it the local name of “Firestone.” 
It is about 9 feet 3 inches thick, consisting of two beds 4 feet 
3 inches and 5 feet respectively. A band of coral (Ithostrotion) 
divides the upper from the lower bed. The latter containing 
more lime than the one above, and their basset edges when 
exposed to the action of the air and rain water on the top of 
the quarry, present the appearance of Red Sandstone, and 
might well be easily taken for that formation elsewhere. 
A microscopical section shows that the rock is almost 
entirely made up of quartz grains, more or less rounded with 
black interstitial matter, probably carbon, and a few joints of 
encrinites. 
In the joints weathered sandy by exposure to the atmo- 
sphere, was the only place where the Brachiopods Spirifera 
octoplicata and Athyris globularis could be obtained at all 
perfect, 
