"Tertiary Igneous (TER-IGN)". Geological Conservation Review GCR Database. Joint Nature Conservation Committee. Archived from the original on 28 September 2007. Retrieved 10 June 2006.
nts.org.uk
Scotland, National Trust for (20 February 2019). "3 key projects". National Trust for Scotland. Archived from the original on 13 July 2019. Retrieved 20 February 2019.
"Tertiary Igneous (TER-IGN)". Geological Conservation Review GCR Database. Joint Nature Conservation Committee. Archived from the original on 28 September 2007. Retrieved 10 June 2006.
Scotland, National Trust for (20 February 2019). "3 key projects". National Trust for Scotland. Archived from the original on 13 July 2019. Retrieved 20 February 2019.