191 



Teesdale ice-stvciuu was first <iu tlie <;TovnHl in Cleveland. lie 

 thinks that the congestion of ice in the Irish Sea was caused 

 sj^ecially by " a great influx of ice from the Clyde ""' for which 

 there is evidence in the shape of glacial striap, shell fragments and 

 boulders. It was the westward pressure of the Scandniavian 

 ice-sheet which caused the Clyde ice to attain such large 

 proportions. 



The Firth of Forth is only about ]0n miles north of the 

 motitli of the Tees, and it is consequently rather curious that the 

 ice radiating from the head of the Baltic .should have exerted siich 

 pressure for a long period up the Forth Valley as to have causeel 

 the Eden A' alley ice to flow out at Tees-mouth. And that it did thus 

 flow for a lengthened period is evidenced liy the large number of 

 blocks of Shap Granite strewed along the Yorkshire Coast. Still, 

 as Mr. Kendall says, the impact of the Scandinavian ice would 

 proceed from north to south, and it might take it a very long time 

 to advance from the Forth to the Tees. 



But in time it did reach the Tees-mouth area, and forced back 

 the Teesdale ice into the Vale of York. It is not, however, certain 

 that the Scandinavian ice ever actually reached the Yorkshire 

 Coast-line. It might turn back the Avestern ice without doing 

 this, and the Scandinavian rocks found within that line may 

 conceivably have Ijeen floated toM'ards the coast in bergs breaking 

 from the Scandinavian ice-face in the earlier stages of its advance, 

 dropped upon the sea flooi far to the west, and later }iicked up liy 

 the glacier moving on from southern Scotland. 



Thirdly and lastly, according to Mr. Kendall, there came into 

 our district a stream of ice from the Cheviot Hills, and probably 

 fi'om Tweeddale. This stream came in between the other two, 

 and apparently to some extent overrode them, bringing with it 

 those lilocks and pebbles of ]>()rphyrite, which are so conspicuous 

 in the glacial drift about Ingleby Grcenliow and Swainby. Some 

 Aveeks ago I accompanied Mr. Kendall and other friends in an 

 excursion into Tweeddale for the purpose of collecting rocks 

 Avhich might have given iirigin to boulders : and the rocks which 

 I collected there I shall endeavour to match with specimens 

 obtained from our local drift.'"* 



(1) See Mr. Kendall's Pajier, p. 563. 



(2) Mr. Kendall writes, December 21st, 1902, " We had a fine time at 



Kelsey Hill the other day, and I found a luniiber of specimens of 

 the Scottish Trachytes like those aliout Melrose." 



