Vol. 60.] 



OF THE EAST-CENTRAL HIGHLANDS. 



441 



texture and composition will be deposited, provided local currents 

 do not intervene. By joining up these points, we obtain the 



line shown in the 



diagram. 



In this investigation 



the line 



Fig. 8. — Diagram to illustrate the mode of arrangement of the areas 

 in which the typical flaggy ^loine Gneisses now occur, and also 

 the origin of the film- partings, now rich in felted biotite, to which 

 the flaggy aspect of the gneisses is essentially due. 



~ e ^ial 



[For convenience of illustration, it is assumed that the distribution of the 

 detritus brought down is not interfered "with by other local currents. 

 This interference would, of course, occur, and has doubtless added to the 

 difficulty encountered in unravelling the meaning of the distribution of 

 the Moine Gneisses.] 



may be taken as denning the fans of the more sandy material 

 from which the Moine Gneisses have been formed. The typical 

 areas are the larger fans ; the instances of slight reversion to 

 similar conditions of deposition lie within the smaller ones. In 

 addition, the origin of the fine films of chloritic material now 



