Companion Site for Guide to the Geology of Islay Book

This page contains extra supporting information for the Guide to the Geology of Islay including updated information/errors, GPS files and a blog.


If you have any feedback on the book or want to contact the authors please email the Natural History Trust Manager at
Guided tours can be arranged.

Some post-printing Notes/Changes to the Excursions:

Excursion 1 - Portnahaven Note there is a new stile at the now-repaired fence at the start of the coastal path at the north end of Portnahaven village. It has a prominent 'No Dogs' sign!. The wave-generator site has been cleared up.

Excursion 4 - Machir Bay to Saligo Bay A small igneous intrusion of syenitic composition can be found at Saligo Bay at Locality 4.8 about 50m to the N of the large dolerite dyke. It is similar to the intrusion at Locality 4.2. It is erroneously described as being similar to the main dolerite dyke to the south - which it is not! It is not shown on the map in the book but a revised map can be viewed here.  Excursion 4 new map

Excursion 4 - Laggan Point The footbridge over the Laggan River is in a poor state of repair but is still useable with care (as of June 2017)

Excursion 8 - Port Askaig to Bunnahabhain The path up from Carraig Dubh cottage to Ardnahoe is affected by the building works at the new distillery

Excursion 9 - NE Islay An ATV track now links the coastal track to the Dubh Loch starting about 1 km N of the bridge over the Margadale River near [NR 41680 74380]. This is about 1/2 km south of the burn noted in the book and the ATV track can be followed to Dubh Loch from here which is easier than the route described in the book. It is possible to get a boatman to meet you at the lighthouse and take you back to Bunnahabhain if the weather/tides are right! Saves that long walk back! I have produced a detailed 1:10,000 map of the coastal section. (NB The map is at 1:10k only if printed at A3) Excursion 9 1:10k field map

Excursion 10 - Kilnaughton Bay Unfortunatly the kyanite at locality 10.1 has been partly destroyed (see blog entry) and the nice brown rosettes of kyanite shown on photo W10.3 are mostly gone however there are some white 1-2mm blades of white kyanite visible at various horizons if you look hard in the right place!. 

Islay Geology Blog link

GPS files
These GPS exchange files can be loaded to a GPS using Easygps
See the Easygps website for more information, instructions and to download the free software
http://www.easygps.com/ link

Excursion 12
Excursion 11
Excursion 10
Excursion 9
Excursion 8
Excursion 7
Excursion 6
Excursion 5
Excursion 4
Excursion 3
Excursion 2
Excursion 1