Monday, 15 October 2012

Intrusion (quartzite?) sill - south of Saligo


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1 comment:

  1. Anonymous16 October 2012 at 08:34

    It's called a Ring Dyke and the white rock is igneous in origin - formed during volcanic activity, rather than metamorphic like quartzite. This is a particularly fine example and unusual in being of white rock.
    Malcolm

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