OF THE LEVEL OF THE SEA. 61 



a bed 1 40 feet above the present level. In Norfolk,* and 

 in Yorkshire,-f- they have been found at the height of a hun- 

 dred feet. Near Berwick, Mr Milne J observed a tract of 

 table land at the height of a hundred feet above the level 

 of the sea. It consists of vertical strata, which have all had 

 their edges worn down to a level plain, just as would have 

 been the case if the rocks had been exposed to the action of 

 marine currents incessantly sweeping over their edges. 

 When the tide is far out, exactly the same appearance is 

 presented by the vertical rocks which form the bottom of 

 the shore for a considerable distance out from the existing 

 cliffs, and were there to be an elevation of the coast, an- 

 other table land would be formed exactly resembling, but 

 a hundred feet above, the former. 



In the basin of the Forth, beds of razor-fish (solen), and 

 bones of the seal, have been found at the height of ninety 

 feet.§ At that of seventy feet, marine remains have been 

 found on the banks of Loch Lomond, || on the Yorkshire 

 coast,U in Devonshire,** and in the Island of Skye.tt I have 

 found them in several localities in the basin of the Clyde, 

 at the height of from seventy feet to the present high- water 

 mark. 



At an elevation of about forty feet there has been ob- 

 served on many parts of our coasts a series of raised beaches 

 and terraces, which, by their magnitude, indicate the prodi- 

 gious length of time at which the sea level must have been 

 stationary at this height ; and if we may judge of its dura- 



* Phil. Mag. Jan. 1836, p. 30. t Phillip's Geology, p. 198. 



X Fourth Report Brit. Assoc, p. 638. § Wern. Mem. vol. v. p. 572. 



|| Letter from Mr Buchanan of Arden. 

 If By Mr Witham of Laitington. Phillip's Geol. of Yorkshire. 



** Geol. Soc Proc Dec. 14. 1836. 



•rt M'Culloch's Western Islands, vol. i. p. 293. 



