8 
by geologists as of Triassic age ; so the question we have now to 
consider is, seeing that the Magnesian Limestone occurs at some 
distance below, where is the line to be drawn between these 
admittedly Triassic strata and those lower down, which are univers- 
ally recognized as Dyas, Lower New Red, or Permian. The 
question, theoretically, is one of importance, because, what we are 
in search of is, according to old beliefs, not merely a conventional 
line between one sandstone group and another, but “the great 
dividing line between the Paleeozoic rocks and those of Secondary 
Age.” We shall not find it within the Red Rocks at all, here, or 
anywhere else. We may find it at the base of the Red Rocks, but 
it is vain to seek for it in the midst of a virtually continuous series 
of deposits, formed, from base to summit, under one set of 
conditions. 
LOCAL DEVELOPMENT. 
Those who have studied the Cumberland Red Rocks, have 
apparently seen only part of the evidence. Around Carlisle we 
meet with the uppermost strata, but in tracing the beds outward 
from the synclinal axis we do not get more than a few hundred 
feet down in the St. Bees Sandstone, as we trace the rocks south- 
ward, before we come upon a large fault. (See the map, pl. 1.) 
This fault ranges from Castle Carrock past the south of Carlisle, 
to the sea just north of Maryport. It is herein referred to as the 
Maryport Fault. The fault has a considerable throw on the north 
side, perhaps as much as a thousand feet, or rather more, near 
Carlisle, but lessening as it trends westward. The lowest beds of 
the St. Bees Sandstone exposed north of the Maryport fault, locally 
contain a few scattered pebbles of quartzite and quartz, here one 
and there one, much as they occur in the “ Pebble Beds” of the 
Bunter Sandstone in the basin of the Mersey. But they are there 
nevertheless, and in. both areas their presence is not without 
significance. 
- But few geologists appear to have studied the St. Bees Sandstone 
for many miles south of the fault ; those who have done so must 
be aware of the fact that along a wide zone. ranging parallel with 
