450 



Mft. ir. n. j;ead os the 



[vol. Ixxix, 



below. The Arnage rock is doubtless richer in magnesia than the 

 Cullen Quartzite. 



The third and quite subordinate type of sediment of the Fyvie 

 Series is an impure sandy limestone formerly quarried at Auch- 

 nagatt, Michaelmuir, Auchedly, and Ardlethen, where it forms 

 bands, at their broadest less than 90 yards across, in the andalusite- 

 schists and quartzites. One of the purest of these bands is that 

 formerly quarried at Quarryhead, three-quarters of a mile north- 

 west of Auchnagatt Station. In slice, it is seen to consist chiefly 

 of large grains of calcite, together with scarce quartz, alkali- 

 felspar, pyroxene, apatite, and magnetite-grains. By reason of 

 their small bulk these limestones play practically no recognizable 

 part in the contamination-phenomena. 



Table I. — Analyses of Sediments liee those concerned in 

 Contamination. 





I- 



II. 



T. 



III. 



IV. 



SiOo 



53-98 

 1-15 



22-77 

 2-33 

 7-22 

 0-18 



nt, fd. 

 0-12 

 1-97 

 3-16 

 2-97 

 2-14 



nt. fd. 



o-io 



1-87 

 0-17 



nt. id. 



nt. fd. 

 0-04 



58-47 

 1-30 



18-27 

 1-66 

 6-49 

 0-25 



? trace 

 0-05 

 0-78 

 2-64 

 2-84 

 2-46 



nt. fd. 

 009 

 3-37 

 0-15 

 0-60 

 0-72 

 0-08 



63 



20 



} ' 



1 

 



6 

 1 



86-12 



0-39 



5-72 



0-75 



0-61 



0-17 

 nt.fd. 

 nt. fd. 



0-85 



0-04 



3'15 



1-44 

 nt. fd. 



009 



0-27 



0-03 



nt. fd. 



(ZrO 3 =-03) 



0-42 



67-23 ; 



0-86 

 13-38 



1-23 



4-88 



0-16 ; 



iit.fd. 



0-04 



2'08 ! 



4-33 



2-92 1 



1-92 

 nt.fd. 



0-05 



103 



015 



o-oi 



0-07 H 



o-ii 



TiO, 



AI0O3 



Pe 2 3 



FeO 



MnO 



(CoNi)O 



BaO 



CaO 



MgO 



KoO 



NaoO 



Li 2 



HoO at 105° C... 



H 2 above 105° C. ... 

 Po0 5 



FeSo 



Fe 7 S 8 



CO., 





Totals 



10017 



100-22 



100 



100-08 



100-45 





=— - 



I. Andalusite-schist of the Boyndie Bay Group, Wliiteliills, Banffshire (compare 



Fyvie Andalusite-Schist). Anal. E. G. Badley. ' Summary of Progress for 



1921 ' Mem. Geol. Surv. 1922, p. 108. 

 II. Macduff Slate, 2 miles east of Macduff (Banffshire). Anal. E. G. Badley. 



' Summary of Progress for 1921' Mem. Geol. Surv. 1922, p. 108. _ 

 T. Prof. V. M. Goldschmidt's typical 'Miirine Tongestein ' ; see 'Die Kontakt- 



Metamorphose im Kristianiagebiet ' Vidensk. Skrift. I, Mat.-naturv. Klasse, 



1911, No. 1, p. 16. 



III. Cullen Quartzite, Craig Head, Banffshire (compare Fyvie Quartzite). 



E. G. Badley. ' Summary of Progress for 1921 ' Mem. Geol. Surv. 

 p. 108. 



IV. Cowhythe Gneiss, Strathmarchin Bay, Portsoy, Banffshire (compare Ellon 



Gneiss). Anal. E. G. Badley. ' Summary of Progress for 1921 ' 

 Geol. Surv. 1922, p. 108. 



Anal. 

 1922, 



Mt 



The second series of metamorphic schists concerned in the con- 

 tamination of the Arnage Mass occurs south-east of the igneous 

 rocks. This group of schists is well developed around Ellon, and 



