[1]http://www.snh.org.uk/pdfs/publications/geology/mull%20geology.pdf
Bob and Chris have been discussing the geology underlying one of Bob
Whitmire's recent pictures. If they look at page 6 of the above .pdf
about the geology of Mull and Iona, I believe they will see the same
piece of geology along with a geologist's explanation. As I understand
it, the steps are a consequence of successive weathered lava flows. My
wife, who is an amateur geologist found the reference when she felt
that the features were not 'striations'.
Brian Gray
References
1. http://www.snh.org.uk/pdfs/publications/geology/mull%20geology.pdf
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