Download - British Geological Survey
Download - British Geological Survey
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T Permotrias<br />
Z Carboniferous<br />
5 Silurian<br />
Drdovician<br />
3A Ashgill<br />
3C Caradoc<br />
3d Llandeilo<br />
b + + +J and porphyrite<br />
S<br />
__c-<br />
S<br />
I<br />
c-c\<br />
FIG.37: Contoured greyscale plot t<br />
zinc in stream water I<br />
ii I c--r- _ .._,..__ :-<br />
proDaDtllty