Geology of South Donegal - Sheet 3

                                                                                                                                                                                                                                                          1:100,000 series index

Area covered by the Map and Booklet

Area covered by Map


Booklet Contents
  • PREFACE
  • INTRODUCTION TO THE GEOLOGY OF SOUTH DONEGAL
    • Landscape and geology
    • Some geological processes
    • A brief geological history of Donegal
    • Reading the geological map of South Donegal
            • THE BEDROCK GEOLOGY OF SOUTH DONEGAL
              • Mesoproterozoic or Neoproterozoic; Slishwood Division
              • Neoproterozoic; Dalradian Supergroup
              • Late Silurian and Early Devonian Magmatism; the Donegal Batholith
              • Minor igneous intrusions
              • Terranes
              • Upper Palaeozoic sedimentary rocks
                          • NATURAL RESOURCES
                            • Metallic Mineral Deposits
                            • Industrial Minerals and Rocks
                            • Hydrogeology
                                        • REFERENCES AND ADDITIONAL READING LIST
                                        • APPENDIX 1: Regional metamorphism of metabasites in the Lough Derg inlier
                                        • APPENDIX 2: Brief lithological descriptions of map units

                                          • Two plates from the booklet

                                            Plate 3. Clastic dykes interpreted as ice wedge casts deleoped in the upper surface of a Port Askaig Formation
                                            diamictite within the Port Askaig Formation (G 5888 8835, 220m on a bearing of 282° from Lougheraherk school)
                                            at the locality figured by Howarth (1971), and Johnston (1993). Modest sized granite clasts are scattered within the diamictite. Diameter of coin is 31mm.

                                            Photo by C. B.Long.










                                            Carboniferous Basal Conglomerate
                                            Plate 6. The Carboniferous basal conglomerate resting unconformably on the Termon Formation
                                            at the western end of the Largymore outlier, near Shalwy. The cliff is approximately 8m high.

                                            Photo by Conor MacDermot.