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(a) Strato-volcano with feeder dykes and sills
(c) Ardnamurchan peninsula
3
1
2
(b) Collapsed volcano with cone sheets and ring dykes
A
B
2 km
Centre
1
2
3
Volcanic
vents
Ring dyke
Fault
Cone sheet
Ring dykes
Figure 12.5 Mode of formation and the modern landsystem of the Ardnamurchan ring complex, Scottish highlands: (a) an
active strato-volcano with associated dyke and sill complexes, (b) post-eruptive subsidence above the former diapir forms
concentric cones of the original sills whilst minor renewed eruption intrudes ring dykes along fault lines (c) the Ardnamurchan
landscape is dominated by the such phases of Tertiary eruption and collapse eroded down to the line A-B in (b).
Source: In part after Whittow (1992)
Plate 12.2 Mount St Helens stratovolcano in the Cascade Range, Washington State, USA, in 1985. A resurgent volcanic dome
has appeared in the crater formed during the May 1980 blast.
Photo: US Geological Survey
 
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