92 DR. J. A. SMYTHE ON 



The Whin Sill furnishes a great number of boulders east 

 and south of its outcrop. On Alnwick Moor the drift to the 

 west of the local outcrop is charged with whin boulders. The 

 supply has evidently come from a more northerly outcrop, for 

 a drift of boulders can be traced from the neighbourhood of 

 Belford southwards in a direct line with Alnwick Moor. 



Some of the whin dykes west of the Whin Sill furnish 

 streams of boulders which indicate the direction of ice-move- 

 ment over limited areas. Thus boulders from the High Green 

 dyke can be tracked in an easterly direction, and those from 

 the Acklington dyke at Clennel are carried north of the 

 Netherton Burn [6]. Similarly, the characteristic quartz 

 felsite of the dyke at Quickening Cote is found near Linbrig, 

 and the purple porphyrite of the Long Crag dyke is the source 

 of many boulders about Coppath and Castle Hill [6]. 



In the Upper Coquet a general carry from the west has been 

 recognised by Clough ; Redesdale basalts are found in the 

 Lumsden and Ramshope burns, and in the Coquet as far as 

 Philip, Silurians from Harden Edge (1,772 feet) are carried 

 on to the porphyrites of Thirlmoor (1,750 feet), glossy 

 porphyrites of the Upper Coquet are borne east of their source 

 as far as Cushat Law and Wether Cairn, and drift from the 

 Carboniferous area south and west across the southern flanks 

 of the Cheviots up to 1,000 feet [6]. 



Transport from the north is indicated by the drift of sedi- 

 mentary origin which clothes the eastern flanks of the Cheviots 

 to a height of 1,000 feet. Further east the pink limestone with 

 green crinoid stems from Budle Bay occurs at Ellingham [21] 

 and South Charlton, and the reddish sandstones from the 

 neighbourhood of Tweedmouth are traceable for some 

 distance down the coast. 



Though, according to Tate [1], the drift of the neighbour- 

 hood of Alnwick contains no rocks more recent than the 

 Carboniferous, such rocks do occur further south. Magnesian 

 Limestone has been noted in the drift on the coast at many 

 places between Hadston Carrs, near Amble, and the Tyne; 



