554 



SECTIONAL TRANSACTIONS.— C. 



The ' newer ' diorite complex of Glen Doll has been intruded into injection- 

 gneisses — schists intimately injected by Mr. Barrow's ' oUgoclase-biotite-gneiss,' a 

 phase of his ' older ' magma. Close to the north-west and east margins^ of the Glen 

 Doll complex these injection-gneisses have been converted into a variety of almost 

 completely reconstructed homfelses containing cordierite, andalusite, sillimanite, 

 spinel, corundum, &c. The reconstruction is much more marked than in Glen Callater. 

 The change in character of the injection-gneisses as the diorite margin is approached 

 is clear both in the field and under the microscope. 



Dr. R. Campbell. — The Composition of the Conglomerates of the Downtoniati 

 and Lower Old Red Sandstone of the Stonehaven District. 



A general account of the conglomerates of the Downtonian and Lower Old Red 

 Sandstone of south-eastern Kincardineshire has already been published.^ The 

 present communication summarises the results of more detailed investigations, the 

 following tables giving the percentages of boulders in a representative series of con- 

 glomerates. The term ' Caledonian ' is applied to the volcanic rocks because the 

 vulcanicity associated with the Caledonian movements was initiated prior to the 

 deposition of the basement conglomerates of the Lower Old Red Sa.ndstone. The 

 figures are based on systematic laboratory examination of over 5,000 boulders, a 

 large proportion of which have been examined in this section. 



' I have not j-et studied the southern margin. 

 2 Trans. Roy. Soc. Edin., vol. xlviii., p. 923, 1913. 



