By James L. Best, Paul B. Wignall
The Carboniferous Shannon Basin of Western eire has develop into probably the most visited box components on this planet. It offers an excellent chance for studying quite a lot of old 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 world boasts vast outcrops and a few of the main well known sections via turbidites, large-scale tender sediment deformation positive factors and sediments that exhibit a reaction to tectonic and sea-level controls.
This box consultant offers the 1st synthesis of the imperative localities during this region of Western eire, and provides an simply obtainable guide that may consultant the reader to, and inside, quite a lot of sedimentary facies, permitting an realizing of the evolving nature of the fill of this Carboniferous basin and the context of its sedimentary and tectonic evolution. The consultant summarizes fresh and new paintings within the zone by means of a number authors and descriptions problems with present debate about the Shannon Basin and its palaeoenvironmental interpretation. the sector advisor will locate vast use in instructing and examine via educational researchers, specialist and novice geologists, in addition to via utilized geologists, geophysicists and reservoir engineers who use those outcrops as analogues for subsurface reservoirs in lots of components of the world.
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Extra info for A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland
Best and Paul B. Wignall. © 2016 International Association of Sedimentologists. Published 2016 by John Wiley & Sons, Ltd. com/go/best/shannonbasin 35 36 Chapter 3 passes westward into the Atlantic Ocean where it is sharply truncated by the north‐south trending Porcupine Basin; a much younger structure developed around 150 km west of the County Clare coastline (Strogen, 1988). Overall, the Shannon Basin was approximately 250 to 300 km wide along its roughly east‐west axis and at least half that value in a north‐ south orientation.
Asb. Shanagolden Fm. Burren Fm. Durnish Fm. Rathkeale Fm. (+ volcanics ) Holk. Tubber Fm. Arun. (Finavarra Member) Limerick Limestone Fm. ( Waulsortian facies ) Ballynash Mb. Ballysteen Fm. Ballymartin Fm. Ballyvergin Fm. + Ringmoylan Shale Fm. Mellon House Fm. Old Red Sst. 2. A summary of the Lower Carboniferous (Mississippian) stratigraphy of the region (adapted from Shephard‐Thorn (1963), Somerville & Jones (1985), Sleeman & Pracht (1999; copyright Geological Society of Ireland) and Gallagher et al.
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).
A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland by James L. Best, Paul B. Wignall