Layer: Groundwater Rock Units (ID: 0)

Name: Groundwater Rock Units

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV>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’s Groundwater Section have, therefore, evaluated these Formations and Members and reduced them to 27 'Rock Unit Groups' that have hydrogeological significance.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, <UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI>limestone purity and susceptibility to karstification; </LI><LI>bedding presence or absence and its influence on the prevalence of jointing;</LI><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). </LI></UL>The way in which the aquifer classification has been undertaken is on the basis of ‘Rock Unit Groups’rather than the individual ‘rock units’(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).The 27 rock unit groups are as follows:1. Permo-Triassic Sandstones2. Permo-Triassic Mudstones and Gypsum 3. Westphalian Sandstones 4. Westphalian Shales5. Namurian Shales6. Namurian Sandstones7. Namurian Undifferentiated8. Dinantian Shales and Limestones9. Dinantian Mixed Sandstones, Shales and Limestones10. Dinantian Sandstones11. Dinantian Pure Bedded Limestones12. Dinantian Upper Impure Limestones13. Dinantian Dolomitised Limestones14. Dinantian Pure Unbedded Limestones15. Dinantian Lower Impure Limestones16. Dinantian (early) Sandstones, Shales and Limestones17. Dinantian Mudstones and Sandstones (Cork Group)18. Devonian Kiltorcan-type Sandstones19. Devonian Old Red Sandstones20. Silurian Metasediments and Volcanics21. Ordovician Metasediments22. Ordovician Volcanics23. Cambrian Metasediments24. Precambrian Quartzites, Gneisses & Schists25. Precambrian Marbles26. Granites & other Igneous Intrusive rocks27. Basalts & other Volcanic rocksThere is also an ‘unclassified’class for areas of the map where the geology is undefined. Sands and Gravels are defined separately.Scale: 1:100,000</DIV></DIV></DIV>

Service Item Id: ced207395d5d4bc3b0c219d8c463aa11

Copyright Text: Contains Irish Public Sector Data (Geological Survey) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence

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Value: Basalts & other Volcanic rocks
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Value: Permo-Triassic Sandstones
Label: Permo-Triassic Sandstones
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Value: Permo-Triassic Mudstones and Gypsum
Label: Permo-Triassic Mudstones and Gypsum
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Value: Westphalian Sandstones
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Value: Westphalian Shales
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Value: Namurian Shales
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Value: Namurian Sandstones
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Value: Namurian Undifferentiated
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Value: Dinantian Shales and Limestones
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Value: Dinantian Mixed Sandstones, Shales and Limestones
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Value: Dinantian Sandstones
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Value: Dinantian Pure Bedded Limestones
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Value: Dinantian Upper Impure Limestones
Label: Dinantian Upper Impure Limestones
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Value: Dinantian Dolomitised Limestones
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Value: Dinantian Pure Unbedded Limestones
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Value: Dinantian Lower Impure Limestones
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Value: Dinantian (early) Sandstones, Shales and Limestones
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Value: Dinantian Mudstones and Sandstones (Cork Group)
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Value: Devonian Kiltorcan-type Sandstones
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Value: Devonian Old Red Sandstones
Label: Devonian Old Red Sandstones
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Value: Granites & other Igneous Intrusive rocks
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Value: Silurian Metasediments and Volcanics
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Value: Ordovician Metasediments
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Value: Ordovician Volcanics
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Value: Cambrian Metasediments
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Value: Precambrian Quartzites, Gneisses & Schists
Label: Precambrian Quartzites, Gneisses & Schists
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Value: Precambrian Marbles
Label: Precambrian Marbles
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