By James L. Best, Paul B. Wignall
The Carboniferous Shannon Basin of Western eire has develop into probably the most visited box parts on the planet. It offers a terrific chance for studying quite a lot of historic sedimentary environments, together with carbonate shelf, reefs and dust mounds, black shales and phosphates, and a spectrum of deep sea, shallow marine, fluvio-deltaic and alluvial siliciclastic sediments. the realm boasts vast outcrops and a few of the main well known sections via turbidites, large-scale gentle sediment deformation gains and sediments that demonstrate a reaction to tectonic and sea-level controls.
This box consultant offers the 1st synthesis of the valuable localities during this region of Western eire, and provides an simply available guide that may consultant the reader to, and inside, quite a lot of sedimentary facies, permitting an knowing of the evolving nature of the fill of this Carboniferous basin and the context of its sedimentary and tectonic evolution. The advisor summarizes contemporary and new paintings within the sector by way of a variety of authors and descriptions problems with present debate in regards to the Shannon Basin and its palaeoenvironmental interpretation. the sphere consultant will locate wide use in instructing and learn via educational researchers, expert and beginner geologists, in addition to by way of utilized geologists, geophysicists and reservoir engineers who use those outcrops as analogues for subsurface reservoirs in lots of parts of the world.
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Additional info for A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland
As one exam ple, although the distinct marine bands show periods of marine incursion, other evidence of marine influence, in the form of fully bioturbated sediments, is highly variable especially in the Central Clare Group. How are base‐level changes manifested within both the deeper water sediments of the Clare Shales, Ross Sandstone Formation and Gull Island Formation and what role do autocyclic and allocyclic scour play in the marked erosion surfaces that can be seen within the cyclothems?
Basin Models 41 Shannon Basin (Wignall & Best, 2000). Although Collinson and col leagues considered the basin to be developed above the Iapetus Suture, which runs east to west along the Shannon Estuary, the Ross Sandstone Formation turbidites were stated to flow along this axis to the north‐east in the direction of the northern basin margin in the CoMa model. In a re‐validation of the CoMa model, Martinsen et al. (2003) modified it somewhat. They suggested that the early phase of fill, up to a level in the mid Gull Island Formation, was primarily an aggradational infill of a deep, narrow, trough centred at Loop Head in south‐western most County Clare.
The presence of some rudaceous limestones (the Inishtubrid Beds) found in the Corgrig Lodge Formation suggests steep slopes were developed, at least locally, probably associated with small reefs (Sleeman & Pracht, 1999). However, overall a ramp was developed in the Shannon Trough, deepening to the west and north‐west from Limerick (Somerville & Strogen, 1992; Sleeman & Pracht, 1999). Ultimately, by the Brigantian Stage, calciturbidites developed at Ballybunnion in the western‐most outcrops of the Shannon Basin.