on part of Mazunderan. 



581 



neighbouring hillsj surveyed from this height, appear to be all composed of 

 limestone resting- on trap. Here our circuit ended. 



I have only further to remark, that, from the top of the range down to the 

 alluvial plain of Mazunderan, there is little in the course of the two rivers, the 

 Tatar and the Heraz, which can be attributed to the mere action of running- 

 water. Both ravines, especially that from Demavend to Amol, are continu- 

 ous rents from the top to the bottom of the range ; and, narrow though they 

 be, it would be difficult to point out a single spot, where a correspondence of 

 the strata on the opposite sides of the ravine exists. They have evidently 

 been shifted by the successive convulsions which have elevated the range ; an 

 agent which we have seen to be still in operation. 



1 gave up as hopeless all attempts to note the angle and direction of the dip 

 of the strata, as they vary continually, and, on the opposite sides of the river, 

 I may almost say, never correspond. I am thus forced to content myself 

 with stating the general direction of the dip to be north somewhat east. 



' 



Tehran, July 30, 1837. 



4 f2 



