﻿28± Mr. A. L. Fletcher on the 



The following results were obtained : — 



Coarse Detrital Sediments. 



Geological Period. 



Type. 



Locality. 



Badium per gram. 





, Greenish Calcareous 

 Sandstone. 



Stettin. 



3-6x10-12 gram. 





Cretaceous «( 



/ 



1 



Triassic ■{ 



1 

 I 



Yellow Sandstone. 

 Deister Sandstone. 

 Quader Sandstone. 

 Green Sandstone. 

 Green Sandtone. 

 Green Sandstone. 

 Beddish Wealden 

 Sandstone. 



Bed Sandstone. 

 Yellowish Bonebed 



Sandstone. 

 Yellow Bunter Sandstone. 

 Bed Bunter Sandstone. 



Wald. 



Hanover. 



Hartz. 



Ireland. 

 Westphalia. 

 Westphalia. 

 Buckeburg. 



Odenwald. 

 Brunswick. 



Vosges. 

 Baden. 



1-7 „ 



1-5 „ 



1-7 „ 



1-6 



1-4 



1-6 



1-7 „ 



0-8 



1-4 „ 



2-5 „ „ 

 2-1 



( 

 Carboniferous ,..-{ 



/ 

 Devonian ... ■{ 



I 



J 

 1 Dark Grey Sandstone. 



Yellowish Sandstone. 

 | Bed Sandstone. 



Sandstone* -{ 



i Banded Sandstone. 

 Old Bed Sandstone. 



Old Bed Sandstone 



Yellow Sandstone 



(Fresh-water type). 

 Greenish Grey Sandstone. 



Westphalia. 

 Westphalia. 

 Vosges. 

 Fifeshire from 



depth 10<»5 ft. 



Biirnlip Bore. 



JN'ew York. 

 Ireland 



(Kildare). 

 Ireland 



(Dublin). 

 Ireland 



(Kiltorcan). 

 Trier. 



13 



1-6 

 0-9 

 0-5 „ 



1-4 „ 



0-4 „ 



1-4 „ „ 



2-0 „ 

 10 „ 



f 1 EedTorridonian Sandstone. 



Pre-Cambnan v| EedTorridonian Sandstone 



[ and Quartz Conglomerate. 



Unknown ' Diatomaceous Quartz 



Sandstone. 



Scotland 



(Lough Craig). 

 Scotland 



(Isle of Bum). 



0-8 „ „ 

 OS 





1 



1 



Mean... 1-5x10-12 pram. 



A comparatively high result obtained from this rock was not substantiated. 



