﻿286 



Mr. A. L. Fletcher on the 

 Calcareous Sediments. 



Period. 



Type. 



Local ty. 



Radium per gram. 



( 



Pal ud inn-Limestone 

 (Fresh-water). 



Unknown. 



0-7X10-12 gram. 



Tertiary .{ 



Numinulitie 

 Limestone. 



Unknown. 



01 



1 



Liturinella-Limestone 



Rhine Provinces. 



03 



I 



(Fresh-water). 







i 



Indurated Chalk. 



Ireland 



(Galwav). 



03 



\ 



i 



i Limestone. 



Westphalia. 



0-9 





Limestone. 



Westphalia. 



1-2 





Limestone. 



Westphalia. 



1-5 „ 





Chalk 



Riigen. 



08 ,, (mean of 



Cretaceous \ 



(Erdiger Kalk). 





4 results). 





; Turonien Limestone. 



Westphalia. 



None detected. 





Serpuhte Limestone. 



Hanover 



(Leister), 



1*5x10— *2 gram. 





! Yellowish Porous j 









Limestone 

 (Sehaumkalk). J 



Brunswick. 



11 



I 



' 





( 



Spotted Grey Jura 



Saxon v. 



1*0 ,, (mean of 2 





Limestone. 





results). 

 | Mean of 3 al- 



Jurassic ■{ 



White Jura 

 Limestone. 



Wurtemburg. 



03 „ \ most identical 

 { results. 





Earthy Limestone. 



Meudon. 



3-2 





Lithographic 



Solenhofen. 



None detected. 



I 



Limestone. 







Triassic j 



Crystalline granular 

 Dolomite. 



Saxony. 



None detected. 



( 



i 



Dolomite Flagstone 

 (Plattenkalk). 



Hanover. 



02x10-12 gram. 



Permian ...... -\ 



1 



Zech stein Limestone 

 (Bituminous 

 Stinkstone). 



Hartz. 



1-7 



I 



Zechstein Dolomite. 



Hartz. 



1-3 „ (mean of 2 

 results). 



I 



Dolomitic Limestone 



Ireland (Kildare). 



12 



Carboniferous .-{ 



i 



(Earthy). 

 Limestone. 



Ireland (Galway). 



1-0 „ (mean of 2 



I 







results). 



Devonian j 



Granular Dolomite. 



Eifel. 



0-4 



Dolomitic Limestone. 



Rhine Provinces. 



0-4 



1 

 Unknown 



Coral Limestone. 



Unknown. 



0-8 







Mean... 



0-8 X 10— 12 giam. 





