IMPLICATIONS OF NEW MICROFLORAL EVIDENCE FROM THE CLEW BAY COMPLEX FOR SILURIAN RELATIONSHIPS IN THE WESTERN IRISH CALEDONIDES

The supposed Laurentian margin in western Ireland is separated from an Ordovician are-related basin by the Clew Bay Complex and two Silurian successions, informally termed the Croagh Patrick Silurian and the Lo uisburgh Silurian, whose relationships are enigmatic. Palynomorphs, tu bular structures and sheets of cuticle from turbidites within the Clew Bay Complex indicate a Silurian (Wenlock) age. In the light of these new data and reappraisal of contacts, the Croagh Patrick Silurian is n ow considered to be in tectonic contact with the Clew Bay Complex. The Louisburgh Silurian may also be in tectonic contact with parts of the Clew Bay Complex and unconformable on other parts, bur is probably yo unger than previously thought. The Silurian age of elements of the Cle w Bay Complex, and the relationship of the complex with other Silurian successions in western Ireland, indicate that significant deformation occurred in this part of the Caledonides during mid to end Silurian t imes, and imply that significant Silurian-Devonian terrane movement to ok place.