444 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 28, 



Fig. 1. — Talus at Hundar, in Nubrd, Ladalch. 



long surface of exposed rock forms a continuous heap, the surface of 

 it (having regard to the size of the fallen pieces) being curiously 

 smooth and the slope very regular. 



Fig. 2 shows a form of talus that may be called a "fan talus." 

 The cause of its peculiar shape is this, that the chief source of the 

 fallen stuff composing it is local, not spread over a long line — or at 

 least that the falls from the cliffs become, by some peculiarity in 

 the form of the rocks and cliffs, concentrated nearly to a point be- 



Fig. 2. — Fan Talus at DesTcit, in Nubrd, LaddkJi. 



fore they can reach their place of rest, and then from that point 

 they spread in a fan-shape in falling and make a surface of loose 

 stones that is in reality part of a cone, of which the slope, in all di- 

 rections from its apex, is at the same angle at which similar material 

 would have staid in such a talus as that first described. 



