A Geological Field Guide to Cooley, Gullion, Mourne & Slieve Croob
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A Geological Field Guide to Cooley, Gullion, Mourne & Slieve Croob Sadhbh Baxter A Geological Field Guide to Cooley, Gullion, Mourne & Slieve Croob Sadhbh Baxter Acknowledgement This fi eld guide was commissioned by Louth County Council, under the Louth Heritage Plan 2007-2011, with guidance from the Louth Heritage Forum, and with generous funding support from the Heritage Council. Printing and distribution of the fi eld guide were generously supported by the Geological Survey of Ireland during 2008, the International Year of Planet Earth. A Geological Field Guide to Cooley, Gullion, Mourne & Slieve Croob Sadhbh Baxter A Geological Field Guide to Cooley, Gullion, Mourne & Slieve Croob Page i 0076957695 llouth.inddouth.indd i 331/8/091/8/09 15:09:0415:09:04 Page ii 0076957695 llouth.inddouth.indd iiii 331/8/091/8/09 15:09:0615:09:06 Contents Page No. List of Figures ..................................................................................................................................................iv Acknowledgements ..........................................................................................................................................vii Using this guide ..................................................................................................................................................x Maps .............................................................................................................................................................viii Introduction .......................................................................................................................................................1 Clocks and rocks: geological time and the rock cycle .........................................................................................4 A well-travelled island: Ireland’s journey across the globe ................................................................................10 The countryside code .......................................................................................................................................20 The Carlingford Complex ................................................................................................................................22 1 Carlingford ......................................................................................................................................24 2 Slieve Foye: Slate Rock .....................................................................................................................28 3 Barnavave ........................................................................................................................................31 4 Grange Irish .....................................................................................................................................33 5 Carlingford Nursing Home ..............................................................................................................35 6 Windy Gap (Long Woman’s Grave) .................................................................................................36 7 Ballaverty – Bush Quarry .................................................................................................................39 8 Templetown Beach ...........................................................................................................................40 The Slieve Gullion Complex .............................................................................................................................43 9 Cam Lough Quarry ..........................................................................................................................45 10 Cam Lough ......................................................................................................................................47 11 Glendesha Forest ..............................................................................................................................49 12 Slieve Gullion Forest Park ................................................................................................................51 13 Forkill Bridge ...................................................................................................................................53 The Mourne Mountains Complex ....................................................................................................................54 14 Cloughmore .....................................................................................................................................56 15 Ameracam Lane ...............................................................................................................................58 16 Nicholsons Road ..............................................................................................................................62 17 Aughrim Quarry ..............................................................................................................................64 18 Banns Road ......................................................................................................................................65 19 Silent Valley .....................................................................................................................................66 20 Pats Road, Kilkeel ............................................................................................................................68 21 Glasdrumman Port ...........................................................................................................................69 22 Bloody Bridge River .........................................................................................................................72 23 Murlough .........................................................................................................................................74 24 Meelmore Lodge ..............................................................................................................................77 25 Happy Valley ...................................................................................................................................78 26 Ott Mountain ..................................................................................................................................79 27 Hen Mountain .................................................................................................................................80 The Newry Igneous Complex ...........................................................................................................................81 28 Slieve Croob .....................................................................................................................................82 Appendix 1: Links with the syllabus .................................................................................................................84 Appendix 2: Bibliography and further reading .................................................................................................86 Appendix 3: Some useful websites ....................................................................................................................87 Appendix 4: Accommodation ...........................................................................................................................88 Glossary ...........................................................................................................................................................89 Index ..............................................................................................................................................................93 Figure Credits ...................................................................................................................................................96 A Geological Field Guide to Cooley, Gullion, Mourne & Slieve Croob Page iii 0076957695 llouth.inddouth.indd iiiiii 331/8/091/8/09 15:09:0615:09:06 List of fi gures Where it was deemed a useful aid to interpretation of either the outcrop or the fi eld photograph, an annotated duplicate photograph has been included in some of the fi gures below. These paired photographs have not been captioned separately. Page No. Figure 1 Geographical map of the Carlingford Lough region, showing upland areas, main settlements, roads, and areas designated as being of Outstanding Natural Beauty. ............................................................... 1 Figure 2 Geographical map of the Carlingford Lough region, showing the location of the sites described in this guide, and an indication of the main geological features seen at each. ..................................... 2 Figure 3 Simplifi ed geological map of the Carlingford Lough region. ...........................................................3 Figure 4 Schematic diagram illustrating the principle of radioactive decay: as the parent isotope (e.g. uranium) decays and becomes less abundant, the daughter isotope (e.g. lead) increases in abundance. Determining the proportions of parent and daughter isotopes in a mineral tells us for how long the decay process has been going on in the mineral. This means that for minerals extracted from an igneous rock, we also know when the rock crystallised from magma. ............... 4 Figure 5 Simplifi ed geological time scale with columns showing events represented by the geology of the Carlingford Lough region (coloured boxes),