In reply to Wicamoi:
Hi,
That's a great resourse, far better than what I was referencing. Doubtlessly it provides up to date classifications. The 'Crossing' crag is located in the Minor Intrusion Suite -Leucotonalite, pegmatitic area. As Kev said, the other crags are in various psammite and pelite group areas.
A quick search showed leucotonalite has been classed with trondhjemite, but that's as much as I could fathom from those older references!
Whatever the geology, as you say, it's a unique rock to climb on, all the better to reward it's remoteness.
Cheers, Iain.
Have a good one on AM next time?