Editing Kilchoan, Beinn na Seilg and Aodann, Ardnamurchan - an excursion

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=== Introduction ===
 
=== Introduction ===
 
Return to the junction of the Sanna road with the Lighthouse road and turn right. Continue along the road for about 1.5 km to a point near the southern end of Lochan na Crannaig, where vehicles may be parked in a lay-by on the left of the road. Head south-westwards across country for about 500 m. using the slightly higher ground to skirt to the north-west of a large area of peat, then south-south­east for a further 400 m to the gorge of the Alit Fhearghais (not named on coloured map). Follow the stream southwards for about 700 m to the col between Beinn na Seilg and Stacan Dubha, and thence to the Lochain Ghleann Locha. Proceed to the western end of the strip of land separating the lochs, to examine relationships between the hypersthene-gabbro, basalt and a pitchstone dyke.
 
Return to the junction of the Sanna road with the Lighthouse road and turn right. Continue along the road for about 1.5 km to a point near the southern end of Lochan na Crannaig, where vehicles may be parked in a lay-by on the left of the road. Head south-westwards across country for about 500 m. using the slightly higher ground to skirt to the north-west of a large area of peat, then south-south­east for a further 400 m to the gorge of the Alit Fhearghais (not named on coloured map). Follow the stream southwards for about 700 m to the col between Beinn na Seilg and Stacan Dubha, and thence to the Lochain Ghleann Locha. Proceed to the western end of the strip of land separating the lochs, to examine relationships between the hypersthene-gabbro, basalt and a pitchstone dyke.
 
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=== Locality 5 [NM 463 638]. ===
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Locality 5 [NM 463 638]. ===
 
The outer contact of the hypersthene­gabbro passes between the lochs. lying in a hollow. bounded to the south by basalt. Judging by the topographic relationships. the contact dips fairly steeply. Cutting the hypersthene-gabbro is a north-north-west trending pitch­stone dyke. This is fairly well exposed near the western end of the south shore of the northern loch, the outcrop displaying the flow-banding characteristic of this particular intrusion.
 
The outer contact of the hypersthene­gabbro passes between the lochs. lying in a hollow. bounded to the south by basalt. Judging by the topographic relationships. the contact dips fairly steeply. Cutting the hypersthene-gabbro is a north-north-west trending pitch­stone dyke. This is fairly well exposed near the western end of the south shore of the northern loch, the outcrop displaying the flow-banding characteristic of this particular intrusion.
  

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