CHAPTER IX. 
DEVONIAN. 
ORIGIN OF THE NAME — MOUNT LAMBIE — OCCURRENCE 
OF DEVONIAN — LIFE OF THE PERIOD. 
Early in the history of geology it was noticed that 
below the coal-bearing strata of England reddish 
sandstones occurred. Above the coal measures another 
red sandstone was known. The lower and older rock 
received the name Old Red Sandstone, while to the 
rock above, and newer than the coal beds, the name 
New Red Sandstone was given. The Old Red 
Sandstone, therefore, lies between the Silurian and 
Carboniferous. In Devonshire a series of limestones 
and shales are extensively developed between Silurian 
and Carboniferous formations. These from their 
position were, it was evident, of the same age as the 
Old Red Sandstones, and were henceforth known as 
Devonian. 
On the Blue Mountains, rocks newer than Silurian 
and older than Carboniferous have been recognised at 
Mount Lambie. Some of these beds can be seen to 
advantage in a cutting on the railway just beyond 
Rydal, and can be studied from this point to the 
summit of Mount Lambie. 
