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There are more than 1,200 geological Formations and Members defined within the Republic. Their delineation is based on a variety of factors, many of which are of no relevance to the hydrogeological properties of the aquifer (for example, type of fossil). GSI<\/SPAN><\/SPAN>\u2019<\/SPAN><\/SPAN>s Groundwater Section have, therefore, evaluated these Formations and Members and reduced them to 27 'Rock Unit Groups' that have hydrogeological significance.<\/SPAN><\/SPAN><\/P>

The Rock Unit Groups are defined within a stratigraphic framework on the basis of what is understand to be important differences between rock units/ rock unit groups in terms of groundwater flow properties. For example, <\/SPAN><\/SPAN><\/P>

  • limestone purity and susceptibility to karstification; <\/SPAN><\/SPAN><\/P><\/LI>

  • bedding presence or absence and its influence on the prevalence of jointing;<\/SPAN><\/SPAN><\/P><\/LI>

  • degree of deformation and its impact on flow properties (e.g., older rocks have been deformed many times since their formation, so lack pore spaces and connected fracture networks). <\/SPAN><\/SPAN><\/P><\/LI><\/UL>

    The way in which the aquifer classification has been undertaken is on the basis of <\/SPAN><\/SPAN>\u2018<\/SPAN><\/SPAN>Rock Unit Groups<\/SPAN><\/SPAN>\u2019<\/SPAN><\/SPAN>rather than the individual <\/SPAN><\/SPAN>\u2018<\/SPAN><\/SPAN>rock units<\/SPAN><\/SPAN>\u2019<\/SPAN><\/SPAN>(Formations). Note that a particular Rock Unit Group can, and often does have, a different aquifer classification in different parts of the country (for example, the Dinantian Pure Unbedded Limestones aquifer classification ranges from Ll to Rkc and Rkd, depending upon location).<\/SPAN><\/SPAN><\/P>

    The 27 rock unit groups are as follows:<\/SPAN><\/SPAN><\/P>

    1. Permo-Triassic Sandstones<\/SPAN><\/SPAN><\/P>

    2. Permo-Triassic Mudstones and Gypsum <\/SPAN><\/SPAN><\/P>

    3. Westphalian Sandstones <\/SPAN><\/SPAN><\/P>

    4. Westphalian Shales<\/SPAN><\/SPAN><\/P>

    5. Namurian Shales<\/SPAN><\/SPAN><\/P>

    6. Namurian Sandstones<\/SPAN><\/SPAN><\/P>

    7. Namurian Undifferentiated<\/SPAN><\/SPAN><\/P>

    8. Dinantian Shales and Limestones<\/SPAN><\/SPAN><\/P>

    9. Dinantian Mixed Sandstones, Shales and Limestones<\/SPAN><\/SPAN><\/P>

    10. Dinantian Sandstones<\/SPAN><\/SPAN><\/P>

    11. Dinantian Pure Bedded Limestones<\/SPAN><\/SPAN><\/P>

    12. Dinantian Upper Impure Limestones<\/SPAN><\/SPAN><\/P>

    13. Dinantian Dolomitised Limestones<\/SPAN><\/SPAN><\/P>

    14. Dinantian Pure Unbedded Limestones<\/SPAN><\/SPAN><\/P>

    15. Dinantian Lower Impure Limestones<\/SPAN><\/SPAN><\/P>

    16. Dinantian (early) Sandstones, Shales and Limestones<\/SPAN><\/SPAN><\/P>

    17. Dinantian Mudstones and Sandstones (Cork Group)<\/SPAN><\/SPAN><\/P>

    18. Devonian Kiltorcan-type Sandstones<\/SPAN><\/SPAN><\/P>

    19. Devonian Old Red Sandstones<\/SPAN><\/SPAN><\/P>

    20. Silurian Metasediments and Volcanics<\/SPAN><\/SPAN><\/P>

    21. Ordovician Metasediments<\/SPAN><\/SPAN><\/P>

    22. Ordovician Volcanics<\/SPAN><\/SPAN><\/P>

    23. Cambrian Metasediments<\/SPAN><\/SPAN><\/P>

    24. Precambrian Quartzites, Gneisses & Schists<\/SPAN><\/SPAN><\/P>

    25. Precambrian Marbles<\/SPAN><\/SPAN><\/P>

    26. Granites & other Igneous Intrusive rocks<\/SPAN><\/SPAN><\/P>

    27. Basalts & other Volcanic rocks<\/SPAN><\/SPAN><\/P>

    There is also an <\/SPAN><\/SPAN>\u2018<\/SPAN><\/SPAN>unclassified<\/SPAN><\/SPAN>\u2019<\/SPAN><\/SPAN>class for areas of the map where the geology is undefined. Sands and Gravels are defined separately.<\/SPAN><\/SPAN><\/P>

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