By James L. Best, Paul B. Wignall
The Carboniferous Shannon Basin of Western eire has develop into the most visited box components on this planet. It offers an incredible chance for studying a variety 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 realm boasts vast outcrops and a few of the main popular sections via turbidites, large-scale tender sediment deformation positive aspects and sediments that exhibit a reaction to tectonic and sea-level controls.
This box consultant offers the 1st synthesis of the significant localities during this region of Western eire, and offers an simply available guide that might advisor 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 consultant summarizes contemporary and new paintings within the region via a variety of authors and descriptions problems with present debate about the Shannon Basin and its palaeoenvironmental interpretation. the sector advisor will locate wide use in educating and study via educational researchers, expert 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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Additional resources for A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland
Abundant palaeocurrent evidence is available to test these two models and fit these in with reconstructions of the depositional systems, including the changing size of fluvial‐deltaic channels in a proximal‐distal traverse and the orientation of any palaeo valleys within these sediments. Furthermore, there is good evidence that the progradation direction of the deltaic systems changed between the Tullig Cyclothem and the overlying Kilkee and Doonlicky Cyclothems (Rider, 1974; Gill, 1979; Pulham, 1989).
Despite this trend, provenance data suggest there is little change. The study of Pointon et al. (2012) showed that all cyclothem sediments possess a major component of southerly‐derived sediment. It is worthy of consideration as to why the predominant flow direction may have changed, how this influenced the resulting depositional geometry and if the source of sediment also changed or whether sediment reworking was a major contributor to the upper cyclothems. 5 What are the various scales of autocyclic and allocyclic control on sedimentation within these Namurian sediments and how are base‐level changes recorded in the rock record within these sediments?
Intriguingly, this modification has turbidity currents flowing along a slope up onto a basin high. , 2003). 1; Pyles, 2007, 2008; Pyles & Jeanette, 2009). However, the model of Pyles differs in significant details. The key difference is that the Shannon Basin is no longer considered to be an elongate trough but rather a minibasin of circular outline analogous to “structurally confined, salt‐withdrawal basins [such as those found today] on the northern Gulf of Mexico continental slope” (Pyles, 2008, p.
A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland by James L. Best, Paul B. Wignall