138 



Mr. Scott on the Banks of the Tistd and Si'ibi'/k. 



On the TisTA River. 



Jt- 3./,.Sff. 7 ■ S. 



The distance from 1 to 12 is about one mile and a half. 



The direction of the strata on the Tista seems to be in general S. 60° W.: 

 but there are a few strata which form an angle with the others^ and run about 

 N.60° W. There did not, however, appear to be any difference in the nature 

 of the rock ; and out of twenty-eight strata observed by the compass, only 

 four followed the latter direction. The specimens from the Tista are the fol- 

 lowing : — 



No. 1. Greenish-grey arenaceous stone of a slaty structure, much inter- 

 spersed with mica ; in strata dipping towards the north, at an angle of about 

 8° with tlie horizon. 



2. Friable sandstone *, resembling small-grained granite, with traces of a 

 slaty structure ; dipping to the south at an angle of 40° (Doubtful whether this 

 was in its natural position). 



3. Sandstone of a slaty structure : the plates are thin, and covered with par- 

 ticles of mica : — strata nearly vertical ; direction S. 60° W. 



4. and 5. Sandstone of similar composition : — strata dipping to the N.W. 

 at an angle of 35° or 40° ; direction S. 60° W. 



6. A similar compound, of fine grain, with traces of a slaty structure : con- 

 tains small rounded fragments. Position and direction as of No. 4. 



7. Similar compound, of distinct slaty structure ; contains pieces of coal and 

 fossil-wood. 



8. Greenish -grey soft arenaceous stone, abounding in micaceous particles. 



9. Coarse sandstone, containing rounded quartz pebbles of various shades of 

 colour, in a paste like the specimens Nos.5, 6, and 7, with small pieces of wood 



* The specimens denominated sandstone in these lists, and to which the term granitic may 

 not incorrectly be applied, appear to have been formed from the detritu,s of granite ; the chief 

 ingredients being quartz and felspar, with mica, and a few minute particles of other minerals. 

 The resemblance to granite is in some of the specimens so strong, that where the rounded form of 

 the quartz is i\ot obvious, they are scarcely to be distinguished from certain varieties of that rock. 



