Thanks for that, Brian (and for yours, Piers). It is really interesting for a
non-geologist.
However, I believe that "striations" remains an appropriate word to use to
describe such lines. It's not necessarily a geological term.
Chris
On 27 Oct 13, at 17:58, Brian Gray <bsg017@xxxxxxxxxxxxxx> wrote:
> [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
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