(southern Isle of Wight), CHALE BAY AND ATHERFIELD POINT An interesting sideline to the history of folding is origin of the coloured sands of parts of the Bracklesham Group at Alum Bay and Redend Point, Studland in Dorset. Whether this ever happens depends on successful exploitation at Balcombe, Fernhurst or Wisborough Green. ... one band of 'Blue Slipper' can clearly be seen. Landslips The Upper Cretaceous Gault Clay underlies a well-developed sequence of porous and permeable Upper Greensand, with Chalk above. Palaeogene The area of the Undercliff is dominated by the Island's 'Blue Slipper' gault clay, while the inner cliff is mainly upper greensand 1 with some chalk. Engineering Geology and Geophysics Group. They have broken off along the vertical joints by which the sandstone is traversed, and as their bases slid forward over the Gault, have acquired a steep landward (northerly) dip. Freshwater Bay (Southwestern I.O.W.) Before drilling the estimated potential recoverable reserves at Sandhills-2 were believed to be 10-15 million barrels in the Great Oolite and 20-80 millions barrels in the Sherwood Sandstone. Tufa There occur throughout this newer gravel a considerable admixture of small rounded detritus of white chalk, which is wholly wanting in the older gravel. Whitecliff Bay webpage. LOCATION: Indeed at Blackgang and Bonchurch, the west and east ends respectively of the Undercliff, there have been great slips within the [last 120 years]." FOR FURTHER CONTENT ON ISLE OF WIGHT SEE: - OTHER ISLE OF WIGHT WEBPAGES: Introduction - Isle of Wight - Historic View - in 1849. In providing field guides on the Internet no person is advised here to undertake geological field work in any way that might involve them in unreasonable risk from cliffs, ledges, rocks, sea or other causes. See particularly |Whitecliff Bay The landslip scene near Blackgang on the Island's southern coast resembled an earthquake disaster area as parts of houses, a road, trees and a car slipped down the cliff towards the beach 200ft below. What a field this opens for enquiry! I moved out as soon as the first tremor started and got to the safety of the Blackgang road. They [the residents] appear to be very stoic. ..... [continues] These accumulation are overlain by the brick-earth deposit, which contains here, as elsewhere, the usual disseminated fragments of angular flint.   Pleistocene deposits include a raised beach of the Foreland near Bembridge, and this was formed by an Interglacial sea-level that was a little higher than that at present. The structural similarity with the Wytch Farm area is obvious, and the hope of finding another highly-successful Wytch Farm Oilfield has clearly been a driving force. A description of the East End landslip which took place in Bonchurch and Luccomb in 1810, will be found in Sir Henry Englefield's "Isle of Wight" [p. 131]. They mentioned (see p.100) that at the eastern (Brook) end of the cutting the St. Margaret's Member is visible (or was visible) just above the scree. It is mandatory to procure user consent prior to running these cookies on your website. Headon Hill and Totland Bay, LOCATION: This seems marginal for oil generation, although an additional minor factor was that this was at about the time of the Cretaceous thermal maximum. There had been been major storms and very heavy rainfall in early 2014. It would be interesting to know whether there is a marked topographic unconformity beneath the Tertiary, rather than just a gradational change due to regional uplift over some distance, and whether there is any truth in the old theory of a rather deep sub-Tertiary valley at Freshwater Gate. More study is needed! in the zones around shear surfaces in landslips.... INTRODUCTION - Safety and Risk Assessment The whole Undercliff has at some time in the past, and as is well-known, collapsed from the upland area of Chalk Downs to the north. There are major unconfomities beneath the Albian, as shown in a sub-Albian map above. The Gault Formation represents a marine transgression following erosion of the Lower Greensand. Trigonia vectiana Lyc. IOW-5-3. Meteorological Office statistics for Winter 2014 show that England and Wales has had its wettest winter in almost 250 years. The weight of the water had undermined the base of the cliff. Some examples of Upper Greensand fossils are shown here. in sand. (southern Isle of Wight), LOCATION: There are a few points to note, specifically, with regard to the Whale Chine area. The Purbeck was found to be 343 feet (104 metres), only a little thinner than in the type section at Durlston Bay. 30-31) and Daley (1989). However, this is not the only possibility and already there is borehole exploration planned for gas at Durlston Head, Swanage (by Infrastrata from California Quarry). .. One evacuated bungalow has already suffered serious structural damage. the Holocene "shell marls" of the Test Valley in Hampshire). "The Country of the Iguanodon. LOCATIONS - "These gravels are well exhibited in the cliff sections of Freshwater Bay, and are interesting and instructive, as they show most clearly that the superficial accumulations such as those which cover so large a portion of the surface of the Isle of Wight, and which to the casual observer would hardly seem capable of subdivision, are yet separable into groups referabletro very distinct periods of past time. The exposure is beneath a mid-Victorian fort, now a private residence. Falcon and Kent (1960), both very notable petroleum geologists, realised that most of the Tertiary structures investigated (Poxwell Pericline, Portsdown Anticline, Chaldon Anticline etc) had developed too late to act as traps for oil migrating towards the edge of the Wessex Basin. After the Miocene folding there is no record of deposition on the Isle of Wight until Pleistocene times. The thrust faults are not seen at the surface here but the visible monoclinal folding is above them and results from uplift and northward movement of the block under the southern half of the Isle of Wight. As in the case of the older (Bartonian) Creechbarrow Limestone, the Bembridge Limestone is probably the result of a lacustrine deposition in proximity to eroded Chalk (on the anticline to the south) providing very carbonate-rich water for the pondsnail limestones (cf. By 2014 it had become a major mudslide extending down to the beach. (Chalk with flints) Freshwater Bay is an interesting locality because the overlying land surface has not been appreciably eroded down here since the late Pleistocene glacial phase. White (1908) did not agree with this and considered that the mucronata Chalk is continuous from Alum Bay to Whitecliff Bay. Fossils of the Tertiary strata include the Eocene fossils of Alum Bay and Whitecliff Bay. The wells would probably be deviated or horizontally extended out to the west. ( Mantell). A reasonable number of images and some text may be used for non-commercial, non-charged, non-online and non- published academic purposes, including field trip handouts, student projects, dissertations etc, providing the source is acknowledged. It consists of sand (some of it dark) mostly derived from the Lower Greensand and with subangular flint and chert pebbles. The area on the cliff top has been changed into Blackgang Chine Theme Park, a good place for children to enjoy. - in boreholes) An interesting feature related to the Inversion Structure, partly explained in the diagram above, is the occurrence of reworked Jurassic (Kimmeridge Clay) ammonites in the Cretaceous strata of Redcliff, Sandown. Some images are not those of the author and the copyright is that of the original photographer and these are not for any use without specific permission from the source photographer. ( Mantell), Introduction - Isle of Wight - Modern View - in 2014 - Dinosaurs and Oil Prospects. LOCATION: Sold at 3 weeks of age. The main focus of interest in the section is on the Bembridge Limestone and the lower part of the overlying Bembridge Marls Member of the Bouldnor Formation. 2 has been sited at Sandhills near Porchfield, in the northern part of the Isle of Wight, not far from Newport (A Sandhills No.1 Borehole had been drilled before 2001). ... although this I suspect not the fault of Gault Clay or 'Blue Slipper'. more information. .. 24 feet or 7.3 m. The clayey beds of this group [the Walpen and Ladder Sands and Clays, VII], throwing out water, form the undercliff upon which Ladder Chine opens. This category only includes cookies that ensures basic functionalities and security features of the website. If migration coincided with this movement, then there may have been not just a tilt up towards the high north of the basin, but also a tilt up westwards. This is more limited quantities gas associated with oil. [Sequence on the West Side of Freshwater Bay. IOW-6-3. This article is about the clay formation. Thames Group The Kimmeridge Clay was probably not, in general, thermally mature. The Arreton Borehole (old studies). The Gault Formation is a geological formation of stiff blue clay deposited in a calm, fairly deep-water marine environment during the Lower Cretaceous Period (Upper and Middle Albian). There is a gas field to the east at Durlston Head. STRATIGRAPHY - Bembridge Limestone and Marls, IOW-3-1. See the lower part of the webpage (scan down): The Gravel of Freshwater Gate, with Elephant's Remains. Before 1960 the exploration commenced at Arreton (Falcon and Kent, 1960). White (1908) did not agree with this and considered that the mucronata Chalk is continuous from Alum Bay to Whitecliff Bay. This steeply north-dipping or vertical Chalk is within the middle limb of the Purbeck - Isle of Wight Monocline (or "Purbeck - Isle of Wight Disturbance" in some oil-industry and structural publications). The place is Fort Redoubt. "I understand the rationale behind them staying for the time being and we are doing every we can to give them sound advice in terms of what their best movement would be from now until we can get this situation sorted out." All rights reserved. There was much flooding in England, and on the coast there were many cliff falls and landslides. -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------. Upper Chalk Parts had already gone over the cliff and the rest stands there on borrowed time. Not all places need be visited and the descriptions and photographs here can be used as an alternative to visiting. IOW-6-16 LOCATIONS - Sandown- Northern

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