igCOMPANY SIR ARCHIBALD GEIKIE’S "ANCIEMT VOLCANOES OF BRITAIN 
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MAP OF THE 
VOLCANIC DISTRICTS 
OF THE 
LOWER OLD RED SANDSTONE 
If-. 
/irt 7 ? 
IN 
CENTRAL SCOTLAND & NORTH EAST IRELAND 
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EXPLANATION OF COLOURING 
Diabascy DoleritCy &>^c. 
( Intrusive) 
’>^'<8..- W1 y-f 
\Felsitey TrachytCy Granite ^e. 
! (intrusive) 
-.’j Vokanic Breccias and Tuffs 
J ( ChieJIy Felsitic) 
^ Volcanic Breccias^ Tuffs, and Conglomerates 
il { ChieJIy 0/ Andesitip Materials) 
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—O/rcvf’f 
^^’ 1 ' 
'Hie Eclmbm-g’li Oporf^'s^liical Tnstihif-e 
