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

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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.
[[File:P000747.jpg|thumbnail|North face of Ben Nevis, Lochaber. The cliffs and summit area consist of a cylindrical mass of Lower Old Red Sandstone andesitic lavas and volcaniclastic rocks. P000747.]]
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[[File:P000747.jpg|thumbnail|P000747]]
 
A 600 m-thick Lower Old Red Sandstone sequence unconformably overlying Dalradian rocks is preserved by subsidence within the central ring-structure of the '''''Ben Nevis Complex''''' (110; Bailey, 1960; [[Media:P000747.jpg|(P000747)]]). It consists principally of hornblende- and biotite-andesites with intercalated agglomerates and sediments, and is believed to be part of a regional lava cover, otherwise completely removed by erosion from the Ben Nevis area.
 
A 600 m-thick Lower Old Red Sandstone sequence unconformably overlying Dalradian rocks is preserved by subsidence within the central ring-structure of the '''''Ben Nevis Complex''''' (110; Bailey, 1960; [[Media:P000747.jpg|(P000747)]]). It consists principally of hornblende- and biotite-andesites with intercalated agglomerates and sediments, and is believed to be part of a regional lava cover, otherwise completely removed by erosion from the Ben Nevis area.
  

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