 In the southwest , around Bantry Bay and the mountains of Macgillicuddy 's Reeks , is an area of substantially deformed , but only lightly metamorphosed , Devonian @-@ aged rocks . This partial ring of " hard rock " geology is covered by a blanket of Carboniferous limestone over the centre of the country , giving rise to a comparatively fertile and lush landscape . The west @-@ coast district of the Burren around Lisdoonvarna has well @-@ developed karst features . Significant stratiform lead @-@ zinc mineralisation is found in the limestones around Silvermines and Tynagh . 
 In the southwest , around Bantry Bay and the mountains of Macgillicuddy <a href='null_genetive' title='1'><mark>'s</mark></a>Reeks , <a href='drop_aux' title='2'><mark>is</mark></a>an area of substantially deformed , but only lightly metamorphosed , Devonian @-@ aged rocks . This partial ring of " hard rock " geology is covered by a blanket of Carboniferous limestone over the centre of the country , giving rise to a comparatively fertile and lush landscape . The west @-@ coast district of the Burren around Lisdoonvarna <a href='got' title='3'><mark>has</mark></a> well @-@ developed karst features . Significant stratiform lead @-@ zinc mineralisation is found in the limestones around Silvermines and Tynagh . 
In the southwest , around Bantry Bay and the mountains of Macgillicuddy  Reeks , an area of substantially deformed , but only lightly metamorphosed , Devonian @-@ aged rocks . dis partial ring of " hard rock " geology is covered by a blanket of Carboniferous limestone ova the centre of the country , givin rise to a comparatively fertile and lush landscape . da west @-@ coast district of tdaBurren around Lisdoonvarna got well @-@ developed karst features . Significant stratiform lead @-@ zinc mineralisation is found in the limestones around Silvermines and Tynagh .