﻿Radium Content of Secondary Hocks. 

 Metamorphosed Sediments (coarse detrital). 



285 



Period. 



Type. 



Locality. 



Radium per gram. 



( 



1 



Permian ■{ 



1 



I 

 ( 



Compact Greenish Grey 



Greywacke. 

 Granular Grey Quartzite. 

 Muscovite Quartzite 



Schist. 

 Baked Sandstone. 



Schistose Blackish Blue 



Quartzite. 

 Schistose Grey Taunus 



Quartzite. 

 Greywacke. 

 Greywacke. 



Hartz. 



Siebengebirge. 



Saxony. 



Budingen. 



Stadtwald. 



Nassau. 



Nassau. 

 Ireland 

 (Valentia). 



20x10-12 gram. 



1-1 



1*5 



None detected in 



6*7 grams. 

 4:0x10-12 gram. 



0-8 



2-7 



0-6 „ 



{ 



Pre- Cambrian 



White Quartzite. 



Scotland. 



0-4 







Mean... 15 X 10-12 gram. 



Argillaceous Metamorphosed Sediments (fine detrital). 



Period. 



Type. 



Locality. 



Radium per gram. 





Roofing Slate. 



Rhine 



Provinces. 



1-3x10-12 gram. 





( 



i 



Carboniferous ... < 



{ 



( 



i 



Devonian ■{ 



{ 



Blue and White " Whet 



Slate." 

 Clay Slate. 

 Burnt Slate. 



Blue Slate. 

 Dark Blue Killas. 

 Clay Slate. 

 Red Clay Slate. 



Green Phyllite. 

 Clay Slate. 



Dark Grey Shale. 



Red Slate. 



Red Slate. 



Red Slate. 



Blue Roofing Slate. 



Andalusite Slate. 



Netherlands. 



Ireland. 

 Laacher See. 



Valentia. 



Cornwall. 



Hartz. 



Nassau. 



Saxony. 

 Schneeberg. 



Moffat, 



Ireland 



(Dublin). 

 Ireland 



(Dublin). 

 Ireland 



(Wh'klow). 

 N. Wales 



(lYnrln n). 

 Vogtland. 



1-6 



P5 

 0-4 



P8 v 

 0-7 

 15 

 P6 



1-6 

 0-9 



11 

 15 



10 „ 



13 

 1 07 



12 „ 





( 

 Cambrian ■{ 



I 







Mean.. 



1-3x10-12 gram. 





