CHAP. XXVIII 
PUYS OF LIDDESDALE 
477 
along the upper parts of the hows. ■ They are thickest towards the north, 
and in Windburgh Hill attain a depth of at least 300 or 400 feet. In 
that part of the district they form the lower and main part of the volcanic 
series, being there covered by a group of tuffs. But a few miles southwards, 
not far to the west of Ivershopefoot, they die out. The tuffs then form the 
whole of the volcanic band which, intercalated in a well-marked group of 
limestones, can be followed across the moors for some six miles into^ the 
valley of the Esk, where an interesting section of them and of the associated 
limestone and shales is exposed (Fig. 174). At Kershopefoot, a higher 
band of basic lava overlies the Kershopefoot limestone, and can he traced in 
scattered patches both on the Scottish and English side of the Border. 
END OF VOL. I. 
Printed by R. & R. Clark, Limited, Edinburgh. 
