Introduction. In two papers read before the Geological Society during the Sessions of the past year*, I endeavoured to describe the phænomena exhibited along the line where the carboniferous chain of Yorkshire and Westmoreland strikes against the old slate rocks of the Cumbrian mountains. Taking up the subject where it had been left by Mr. Phillips†, a series of enormous faults and dislocations were traced, nearly along this line of junction, to the foot of Stainmoor; and it was shown that mountain masses of rock, torn off from the carboniferous series, were thrown down with a reversed dip into the higher part of the valley of the Eden, near Kirkby Stephen; and that after many breaks and contortions, they gradually gained a more regular strike and dip, and were prolonged into a chain, forming the northern outskirt of the primary Cumbrian system, and terminating at Egremont. It was at the same time shown that another fault, ranging under the escarpment of the Cross Fell chain, produced a corresponding effect on that part of the carboniferous series; and that both these great disruptions took place at a period anterior to a portion of the conglomerates of the new red sandstone‡. In this paper I purpose to give a sketch of the new red sandstone series, which spreads from both banks of the Eden to the base of the neighbouring mountains, and afterwards skirts the coasts of Cumberland and Low Furness. In performing this task I shall endeavour to describe in order,