Triassic. 
101 
The first and second of these divisions cannot, 
however, be separated by any hard and fast lines. 
It is convenient, however, to retain the division, 
bearing in mind at the same time that there is no 
essential difference between the fossils of the Sand- 
stones and the Shales. The Hawkesbury-Wianamatta 
Series is a convenient term embracing the two. 
In the British Islands, Triassic rocks are known 
as the New lied Sandstones. This is to distinguish 
them from the other and much older Red Sandstones 
made famous by Hugh Miller. The New Red Sand- 
stones sometimes overlie productive Coal Measures, 
and in that case there is a possibility of finding coal 
below. Some of the Old Red Sandstones are, 
physically, not unlike the New Red Sandstones, but 
as the Old Red are below the Coal Measures, there is 
no hope to find coal by boring through them. Where 
the series is complete, the rocks referred to occur in 
the following manner : — 
1. New Red Sandstones, Triassic. 
2. Permian. 
3. Carboniferous. 
4. Old Red Sandstones, Devonian. 
In Europe, Triassic rocks are remarkable as 
having introduced to the world the age of reptiles. 
1 lore also are met for the first time in the geological 
record the internal bones of cuttle-fish, known as 
Belemnites , and more commonly when found fossil as 
thunder-bolts. 
