By James L. Best, Paul B. Wignall
The Carboniferous Shannon Basin of Western eire has turn into essentially the most visited box parts on the planet. It offers an excellent chance for interpreting a variety of historical 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 wide outcrops and a few of the main popular sections via turbidites, large-scale delicate sediment deformation gains and sediments that exhibit a reaction to tectonic and sea-level controls.
This box consultant offers the 1st synthesis of the critical localities during this sector 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 figuring out 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 via more than a few authors and descriptions problems with present debate about the Shannon Basin and its palaeoenvironmental interpretation. the sector advisor will locate broad use in educating and learn through educational researchers, specialist and novice geologists, in addition to through 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
The interpretation of the Clare Shale in northern County Clare is especially contentious. In the WiBe model, the black shales are deep water, low energy deposits accu mulated in a distal basinal setting, whilst the other models suggest high energy, winnowed accumulation on a basin margin. 2 What direction was downslope? There are an unrivalled variety and abundance of slope collapse indicators to be seen in the Shannon Basin. , 2003; Wignall & Best, 2000, 2002, 2004). The CoMa model envisages slope progradation to the south‐east and its proposers have supported this assertion with several studies of large slumps in the Gull Island Formation (Martinsen & Bakken, 1990).
Where there is reasonable control on the large‐scale map pattern of folds, these are seen to be periclinal (Dolan, 1984; Gill, 1979). There is also a marked lithological control on fold geometries, with open, long, wavelength structures in the early Mississippian carbonates (Fig. 3B, C, D and E). This disharmony of structure implies some accommodation of strain within the muddy Clare Shales. A detailed, balanced cross‐section of west County Clare has been produced by Tanner et al. 4). Tanner et al.
The pressure solution seams of insoluble residue typically weather preferentially to produce a series of anastamosing cracks in plan view on many exposed bedding surfaces throughout the basin. H) Anastamosing pressure solution seams on bedding plane of Ross Sandstone, Bridges of Ross (UTM 441574 m E 5827293 m N; Map 63, 073833 m E, 150612 m N). The cleavage is slightly oblique to the fold hinge. 5 km 0 Younger Cyclothems Ross Sandstone Formation Kilkee Cyclothem Clare Shale Formation Tullig Cyclothem Fig.