i 



Synopsis of the Principal Heavy Minerals from the Sand of 



AND from the Upper Carbonifero 



[Occurrence represented by X • Frequenc}- represented by X L 



Rock StanroUte. Ihnenite. 



1. TsTottingham- X X X X X X 



shire- • /-, • 



( (jrrains 



very fresh, 



usually. 



Zircon. Tourmaline. Entile. 



XXX XXX XX 



2. Cannock 

 Chase. 



XXX XXX XXX XXX 



Grains ! 



often I j 



more or less 

 decomposed. ' i 



X X 



3. Cheshire 



4, Cromford 

 j neighboLTrhood 

 ' —Derbyshire. 



XX |XXx! XXX XXX 



Much I I 



decomposition | 



of grains. , 



X X 



XXX 



Zircon 



larger than 



in the above 



localities. 



XX 



Much fewer 

 nearly rotind 

 grains than 

 in the above 

 localities. 



XX 



Generally 

 much largei 

 and more 

 fragmental 

 than in 

 the above 

 localities. 



Much the most extensive development in Scotland appears to be 

 that described in the South-East Highlands by Mr. Gr. Barrow. 



It thus seems evident that northern areas were capable of 

 supplying the staurolite. 



Shimmer-aggregates, 1 sillimanite, kyanite, ilmenite, and micro- 

 dine, obviously from metamorphic areas, are most likely, in the 

 imain, from the same sources. 



' In the Highlands, tourmaline is common and widespread.' 2 



1 G. Barrow, Q. J. G. S. vol. xlix (1893) p. 340 & pi. xvi, fig. 5. 

 - T. O, Bosworth, ibid. vol. Ixvi (1910) pp. 394, 395. 



