Fisherman's Pt Ross Fm



Eroded bedding planes of the Namurian deepwater sediments of the Ross Formation exposing rippled and scoured surfaces of the sediments of this deepwater system. Fisherman's Point ledge in the background to the left and northwest. Eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation, overlain by turf covered Pleistocene drift. Fisherman's Point ledge can be seen in the middle background to the north. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation, overlain by turf covered Pleistocene drift. Fisherman's Point ledge is situated in the middle background to the north. In foreground are bedded and slumped sediments of the Ross Formation. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation, overlain by turf covered Pleistocene drift. Fisherman's Point ledge is situated in the middle background to the north. In foreground are bedded and slumped sediments of the Ross Formation. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation, overlain by turf covered Pleistocene drift. Fisherman's Point ledge is situated in the middle background to the north. In foreground are bedded and slumped sediments of the Ross Formation. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation. Fisherman's Point ledge is situated to the left background to north. In foreground are bedded and slumped sediments of the Ross Formation. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation, overlain by turf covered Pleistocene drift. Fisherman's Point ledge to left and north. In foreground to left are bedded and slumped sediments of the Ross Formation. Turf covered Pleistocene drift exposed in foreground to right. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation. Fisherman's Point ledge is situated in the middle background to the north. In foreground are bedded and slumped sediments of the Ross Formation. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation just south of Fisherman's Point. In foreground are bedded and slumped sediments of the Ross Formation. Cliffs and eroded bedding planes of the coastal monocline of Namurian deepwater sediments of the Ross Formation just south of Fisherman's Point. In foreground are bedded and slumped sediments of the Ross Formation. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation. This outcrop is exposed in the flank of a monocline. The channel fill overtops the channeling forming winged onlapping overbank sands. In foreground are bedded and slumped sedments. Exposed in the flank of a monocline are the Fisherman's Point Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation. Channel fill overtops the channeling forming winged onlapping overbank sands. Exposed in the flank of a monocline are the Fisherman's Point Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation. Channel fill overtops the channeling forming winged onlapping overbank sands. Exposed in the flank of a monocline are the Fisherman's Point Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation. Channel fill overtops the channeling forming winged onlapping overbank sands. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Namurian deepwater sediments exposed in flank of monocline at Fisherman's Point . Note the cut and fill of channeled Ross Formation. Namurian deepwater sediments exposed in eastern flank of monocline at Fisherman's Point exhibiting cut and fill of channeled Ross Formation. Exposed in the flank of a monocline are the Fisherman's Point Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation. Channel fill overtops the channeling forming winged onlapping overbank sands. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point exposing Namurian deepwater sediments. Note the cut and fill of channeled Ross Formation on the flank of the coastal monocline. Fisherman's Point deepwater sediments. Bedding plane of the cut and fill of channeled Ross Formation. Fisherman's Point deepwater sediments. Bedding plane of the cut and fill of channeled Ross Formation. Just south of Fisherman's Point the deepwater sediments of Ross Formation are exposed submarine sand volcanos. Just south of Fisherman's Point the deepwater sediments of Ross Formation rubble beneath turf. Bedding plane exposed at Fisherman's Point in the deepwater sediments of Ross Formation. Bedding plane at Fisherman's Point in the deepwater sediments of Ross Formation. Exposures of a bedding plane surface in the Upper Carboniferous Ross Sandstone in which sand volcanoes overly local slumps of the deepwater sediment close to at Fisherman's Point. Volcanoes are built by sands transported by water released when the slide compacted beneath its own weight. Flank slopes reach 15° (Gill & Kuenen, 1958) with slightly concave outer slopes exhibiting flow runnels and ridges down the flanks with a central sand filledcrater (Strachen, 2002). Exposures of a bedding plane surface in the Upper Carboniferous Ross Sandstone in which sand volcanoes overly local slumps of the deepwater sediment close to at Fisherman's Point. Volcanoes are built by sands transported by water released when the slide compacted beneath its own weight. Flank slopes reach 15° (Gill & Kuenen, 1958) with slightly concave outer slopes exhibiting flow runnels and ridges down the flanks with a central sand filledcrater (Strachen, 2002). Exposures of a bedding plane surface in the Upper Carboniferous Ross Sandstone in which sand volcanoes overly local slumps of the deepwater sediment close to at Fisherman's Point. Volcanoes are built by sands transported by water released when the slide compacted beneath its own weight. Flank slopes reach 15° (Gill & Kuenen, 1958) with slightly concave outer slopes exhibiting flow runnels and ridges down the flanks with a central sand filledcrater (Strachen, 2002). Exposures of a bedding plane surface in the Upper Carboniferous Ross Sandstone in which sand volcanoes overly local slumps of the deepwater sediment close to at Fisherman's Point. Volcanoes are built by sands transported by water released when the slide compacted beneath its own weight. Flank slopes reach 15° (Gill & Kuenen, 1958) with slightly concave outer slopes exhibiting flow runnels and ridges down the flanks with a central sand filledcrater (Strachen, 2002). Exposures of a bedding plane surface in the Upper Carboniferous Ross Sandstone in which sand volcanoes overly local slumps of the deepwater sediment close to at Fisherman's Point. Volcanoes are built by sands transported by water released when the slide compacted beneath its own weight. Flank slopes reach 15° (Gill & Kuenen, 1958) with slightly concave outer slopes exhibiting flow runnels and ridges down the flanks with a central sand filledcrater (Strachen, 2002). Exposures of rippled on bedding plane surfaces of the deepwater sediment of the Upper Carboniferous Ross Sandstone close to at Fisherman's Point. Exposures of rippled on bedding plane surfaces of the deepwater sediment of the Upper Carboniferous Ross Sandstone close to at Fisherman's Point. Exposures of rippled on bedding plane surfaces of the deepwater sediment of the Upper Carboniferous Ross Sandstone close to at Fisherman's Point. Exposures of rippled on bedding plane surfaces of the deepwater sediment of the Upper Carboniferous Ross Sandstone close to at Fisherman's Point. Exposures of rippled on bedding plane surfaces of the deepwater sediment of the Upper Carboniferous Ross Sandstone close to at Fisherman's Point. Exposures of rippled on bedding plane surfaces of the deepwater sediment of the Upper Carboniferous Ross Sandstone close to at Fisherman's Point. Cliffs and eroded bedding planes of the Namurian of slumped and bedded deepwater sediments of the Ross Formation, in close vicinity to Fisherman's Point. Moniclinically folded deepwater sediment of the Upper Carboniferous Namurian Ross Sandstone just south of Fisherman's Point, which is visible in background to the left and north-westward. Moniclinically folded deepwater sediment of the Upper Carboniferous Namurian Ross Sandstone just south of Fisherman's Point. Moniclinically folded deepwater sediment of the Upper Carboniferous Namurian Ross Sandstone just south of Fisherman's Point. Moniclinically folded deepwater sediment of the Upper Carboniferous Namurian Ross Sandstone just south of Fisherman's Point. Moniclinically folded deepwater sediment of the Upper Carboniferous Namurian Ross Sandstone just south of Fisherman's Point. Slumping turfcovered cliffs just south of Fisherman's Point. Cliffs of the Namurian of slumped and bedded deepwater sediments of the Ross Formation,just north of Fisherman's Point.


Deepwater Fisherman's Point Ross Formation
 
Deepwater Channels, Slumps and Submarine Sand Volcanoes

North of the Shannon Estuary the Upper Ross Formation outcrops in cliffs of Namurian sediments along Atlantic shore at Fisherman's Point.  At this locality deepwater fan lobes are channeled into one another and overlie the slumped horizons. The sheets of sand forming the fan lobes are characterized by incised stacked channels. The sandstone fill of the channels sometimes extends beyond the channels as wings (Elliot, 2000).

Locally sand volcanoes occur on bedding planes and were formed by sands transported upward from within slides by water released when the slide was compacted beneath its own weight. Flank slopes of the sand volcanoes reach 15° (Gill & Kuenen, 1958) with slightly concave outer slopes exhibiting flow runnels and ridges down the flanks with a central sand filled crater (Strachen, 2002).  On other bedding planes ripples generated by currents in the deeperwater setting are common in the sandy sediments.

Photos by Christopher Kendall, Peter Haughton and David Pyles.
 
References
Elliott, T., 2000, Depositional architecture of a sand-rich, channelized turbidite system: the Upper Carboniferous Ross Sandstone Formation, Western Ireland. in P. Weimer, R. M. Slatt, A. H. Bouma, and D. T. Lawrence, eds., Deep-water reservoirs of the world: Gulf Coast Section SEPM Foundation, Twentieth Annual Research Conference, p. 342–373.
Gill, W. D., and Kuenen, P. H. 1958, Syndepositional sliding and slumping in the West Clare Namurian Basin, Ireland. Geol. Surv. Irel., Spec. Pub. 4, 1-121.
Strachan, L. J., 2002, Slump-initiated and controlled syndepositional sandstone remobilization: an example from the Namurian of County Clare, Ireland: Sedimentology, v. 49, p. 25-41.
Friday, December 13, 2013
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