Editing Lower Old Red Sandstone volcanism, Caledonian magmatism, Grampian Highlands

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::Group 1—basalts and pyroxene-andesite lavas  
 
::Group 1—basalts and pyroxene-andesite lavas  
'''First cycle of caldera formation'''  
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::'''First cycle of caldera formation'''  
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::Lower Group 2—andesite and rhyolite lavas, interbedded with a thin ignimbrite layer near the top
 
::Lower Group 2—andesite and rhyolite lavas, interbedded with a thin ignimbrite layer near the top
 
::Upper Group 2—rhyodacitic ignimbrite flow
 
::Upper Group 2—rhyodacitic ignimbrite flow
 
::''Possible hiatus in volcanic activity''
 
::''Possible hiatus in volcanic activity''
::Group 3—breccias, grits and shales
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#Group 3—breccias, grits and shales
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'''Second cycle of caldera formation'''
 
'''Second cycle of caldera formation'''
::Group 4—hornblende-andesite lavas  
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#Group 4—hornblende-andesite lavas  
::Group 5—rhyodacitic ignimbrite flow
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#Group 5—rhyodacitic ignimbrite flow
::''Possible hiatus in volcanic activity''
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::Group 6—grits and shales
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''Possible hiatus in volcanic activity''
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 +
#Group 6—grits and shales
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'''Subsequent''' stages of volcanic activity
 
'''Subsequent''' stages of volcanic activity
::Group 7—andesite and rhyolite lavas, interbedded with a thin ignimbrite flow
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#Group 7—andesite and rhyolite lavas, interbedded with a thin ignimbrite flow
  
 
The first stage of caldera formation was marked by a considerably larger movement along the north-east part of the ring-fracture than along the south-west part. However, during the second period of caldera formation the amount of movement along the ring fracture was roughly uniform. The Fault Intrusion follows the ring-fracture and shows flow structures; it was the feeder for the Upper Group 2 and Group 5 ignimbrites, which appear to have completely filled the caldera and flowed possibly as far as the Lorn Plateau.
 
The first stage of caldera formation was marked by a considerably larger movement along the north-east part of the ring-fracture than along the south-west part. However, during the second period of caldera formation the amount of movement along the ring fracture was roughly uniform. The Fault Intrusion follows the ring-fracture and shows flow structures; it was the feeder for the Upper Group 2 and Group 5 ignimbrites, which appear to have completely filled the caldera and flowed possibly as far as the Lorn Plateau.

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