1893-94.3 









125 





















Table showing the percentage of Rocks in 100 Boulders taken at random. 





60 









• 



G> 



pi 

















DESCRIPTION OF 

 EOCKS. 



5 



i-s 

 is 



■a«H 



O 







• 



_Q CD 



<a> =« 

 a> »h 



S-t 3 



ra 



1—1 





 P 



CO 



,3 



. 



Pi C9 

 •« O 



to °s 



r it 







p 





 P 



6 

 O 



cf 



• iH 

 ft 

 CQ 



w 



a> 



ED 



ee 

 O 



Q .a 



O O 



bOqn 



rtf O 



'u <x> 



O 



pj 



H 





 3 

 



CD 



rs 



"do 



0" 



p 



09 



O 



g c3 

 ■43 © 



OR 







O 

 P 



ca 



<s 



G? 



,4 



to 

 ca 

 o> 



E 







ca 



i 











00 



PI 

 



a 

 i 



ca 

 O 



ca 



pt 

 G? 



O 



P 



a 



w 



co 

 09 



6 



P 



•a 



W 



6 



P 



Granite 











5 



8 



8 









Granitic 



• •• 













2 











1 





i 



Porphyry 



«•- 





... 







... 









... 





>•• 





... 



Porphyritic 









... 









*4 









... 



... 



... 



Basalt 



72 



57 



48 



19 



... 







10 



"5 



82 



83 



42 



46 



86 



Amygdaloidal Basalt ... 



6 



12 



13 

























Quartz 



.. 





... 



3 



5 





2 



3 





6 





"4 



... 





Quartz vein 



,. 











1 



















Quartzite ... 



... 







9 







1 



4 



2 



2 





10 



"7 



3 



Brecciated Conglomerate 



... 







1 

















• • • 





... 



Silurian grit 



... 



... 





36 



89 



90 



78 



51 



39 







15 



*4 



3 



Slaty rocks 



I4 



... 





14 







9 



2 









... 







Claystone 





. •• 























2 





Triassic 









4 



1 









35 







*3 







Liassic 































Greensand 





















1 











Chalk 



22 



Chalk & flint 



31 



39 



2 







... 



... 



... 



53 





19 



32 



— 



Flints 





• • • 





12 









14 



8 



5 



5 



2 



8 



6 



Micaceous sandstone 























3 









Carboniferous shale 























3 









Felstone 























3 









Garnet stone 























1 









Volcanic ash ... 























1 









Mica schist 























1 



2 



1 





Undetermined 



... 



... 





•• 





1 





... 





... 





••• 





i 



Total 



100 



100 



100 



100 



100 



100 



100 



90 



90 



150 



100 



100 



100 



100 

































