Rocken End is a rugged, less-visited promontory shaped by large coastal landslides. Loose Upper Greensand and basal Chalk material can yield ammonites and other molluscs, but mixed fallen blocks and an uneven tidal shore make provenance and a cautious approach particularly important.
FIND FREQUENCY: ♦♦♦ – There is a moderate chance of finding fossils in loose material; complete ammonites are not routine finds.
CHILDREN: ♦♦ – The uneven landslip approach and exposed boulder shore make this unsuitable as a casual family collecting outing.
ACCESS: ♦♦♦ – Approach on established paths from Sandrock Road; steep and slippery ground requires care.
TYPE: – Landslide-derived foreshore blocks and nodules; avoid the old quarry and unstable faces.
DIRECTIONS
♦ Approach Niton, descend Barrack Shute towards St Lawrence, turn into St Catherine’s Road, turn right after the pub and then left into Sandrock Road. Sandrock Road is narrow and unsuitable for coaches. Use the National Trust car park at the road’s western cul-de-sac (SZ 494 758).
♦ Continue on the signed paths towards the coast and Rocken End, keeping to the existing route through the uneven landslip terrain. This is a walking approach, with steep and slippery sections; check local closure notices.
♦ Cafés and toilets are available in Niton village. Do not assume that facilities are provided at the car park or on the beach.
FOSSIL HUNTING
The useful collecting ground is the eroding debris and loose material on the shore. Blocks of different rocks are mixed together by landsliding, so a fossil found in one boulder cannot be assigned to the bed immediately behind it. Look at the matrix as well as the fossil and record whether it came from a loose block, a nodule or an intact exposure.
Pale and greenish Upper Greensand blocks may contain molluscan remains, whereas phosphatic fossils in glauconitic, chalky matrix belong to the basal Chalk interval. The Glauconitic Marl has yielded ammonites: the holotype of Lewesiceras wiedmanni is documented from Rocken End. This is a scientific provenance record, not an indication that complete specimens are common.
The old collecting guide records Hypoturrilites, Schloenbachia and Idiohamites, with bivalves, gastropods and brachiopods, in the nodule-bearing material. Treat these as recorded possibilities rather than a checklist of expected finds. Inspect weathered surfaces without climbing the unstable slopes, entering a falling face, or opening the old quarry. A fragment with diagnostic ornament can be more informative than a large unidentifiable block.
A chronological record of significant fossil discoveries and geological research at Rocken End.
1799 – Pitlands Farm landslide
A major movement at Rocken End destroyed part of Pitlands Farm and led to its abandonment. The event documents historical instability of the landscape now crossed on the approach.
1818 – Renewed ground movement
Further landsliding affected the former farm area, contributing to the abandonment of ground that later became scrub-covered.
1847 – The coastal reference section described
William Henry Fitton published his stratigraphical account of the coast from Atherfield to Rocken End. Rocken End formed the south-eastern end of this foundational Lower Greensand section.
1928 – Major fall reshaped the promontory
A major landslide at Gore Cliff and Rocken End displaced large blocks and destroyed the old Niton–Chale road. Its debris remains an important element of the coastal form.
1984 – An ammonite named from Rocken End material
Wright and Kennedy described Lewesiceras wiedmanni. Its holotype, BMNH C83568, came from the phosphatic Glauconitic Marl at Rocken End, giving the locality a direct role in ammonite taxonomy.
2003 – Coast protected within an enlarged SSSI
The Compton Chine to Steephill Cove SSSI notification recognised the coast’s geological, geomorphological and biological interest, including the landslips and source cliffs around Rocken End.
GEOLOGY
Rocken End is a landslide-built promontory. Its low sea cliffs and boulder shore expose displaced material brought down from the higher succession rather than a continuous upright stratigraphic column. Slipped blocks may tilt steeply landwards and rest far below their original level.
The source succession includes Lower Greensand, Gault, Upper Greensand and basal Chalk. Differences in permeability and strength are central to the landscape: groundwater and weak clay horizons help destabilise the overlying sandstones, while marine erosion removes support at the foot of the slope. The famous 1928 fall is part of a longer sequence of movements, not the sole event that formed the undercliff.
Detailed geology and stratigraphy of Rocken End.
Rocken End promontory, its landslide-derived shore blocks and the approach from Sandrock Road. Gore Cliff is source-area context; the whole Atherfield–Rocken End coastal type section is not presented as one beach log.
LOWER GREENSAND GROUP
The older source rocks are sandy Lower Cretaceous deposits. Do not confuse these with the younger Upper Greensand.
Sandrock Formation
Sandstone and muddy intervals form part of the basal slope beneath the later rocks. Its type section extends from Rocken End towards Blackgang Chine; that longer section contains repeated sand–mud rhythms. Here these units help control instability and are not a guaranteed complete foreshore exposure.
Monks Bay Sandstone Formation
The unit historically called Carstone belongs above the Sandrock and below the Gault in the source-area framework. Iron-rich coarse sandstone and pebbly material must be distinguished from Upper Greensand blocks. Do not interpret an isolated block as an in-situ contact.
SELBORNE GROUP
The Gault and Upper Greensand form the younger Lower Cretaceous part of the source succession.
Gault Formation
Clay beneath the stronger Upper Greensand is important in landslide development. Exposure is often obscured by debris; the old statement that it is wholly unfossiliferous here should not be used as a general property of the formation.
Upper Greensand Formation
Sandstone-rich blocks are conspicuous among the fallen debris. Their present attitude and level can be a result of rotation and transport down the slope. A complete Gore Cliff bed numbering or thickness must not be transferred to these detached blocks.
CHALK GROUP
The youngest fossil-bearing bedrock represented in the collecting debris is from the basal Chalk succession.
GREY CHALK SUBGROUP
The lower Chalk is represented by marly, glauconitic material rather than the flinty white chalk characteristic of the island’s northern ridge.
West Melbury Marly Chalk Formation
The basal Chalk includes the fossiliferous Glauconitic Marl. The distinction from the underlying Upper Greensand is essential when recording ammonites from the shore.
Glauconitic Marl Member
Dark green glauconitic matrix and phosphatic material represent the condensed basal Chalk interval. The documented Lewesiceras wiedmanni type specimen is from this unit at Rocken End, assigned to the Lower Cenomanian Mantelliceras mantelli Zone and Neostlingoceras carcitanense Subzone. The nodule fauna belongs here, not indiscriminately to the Upper Greensand.
Landslide debris and modern beach deposits
Mixed blocks, mud and beach sediment are displaced or superficial material. They are not an additional bedrock formation and should be shown separately from the source succession.
References
Hopson, Wilkinson and Woods (2008), Lower Cretaceous stratigraphical framework
Hopson and Farrant (2015), Geology of the Isle of Wight
Geologie und Paläontologie in Westfalen 51, Lewesiceras account, p.86
English Nature (2003), Compton Chine to Steephill Cove SSSI citation
Isle of Wight SMP2, coastal dynamics, Rocken End–Chale
Ian West, Isle of Wight geological introduction
SAFETY
Choose a falling tide and allow a generous return margin: waves can reach the low cliff and boulder margins. An exposed headland in onshore swell is unsuitable even if the predicted tide is low.
Stay away from fresh falls, overhangs and the bases of the high slopes. Do not climb the landslip blocks or enter the small quarry described in the old guide. Mud, loose rock and hidden gaps make the shore and approach more demanding than the old family-outing description suggests.
EQUIPMENT
Take tide information, a charged phone, sturdy footwear, a hand lens, labels and small rigid containers with wrapping material. Choose loose specimens that can be lifted safely. Heavy tools are not a substitute for permission or safe access.
CLEANING AND TREATING
Keep a fossil and its surrounding nodule together, wrap it separately and retain the exact find record. Start with a soft brush only after checking that the matrix is stable; do not force a weathered ammonite out of a hard phosphatic nodule.
Allow wet specimens to dry gradually. Avoid acids, bleach and routine varnish. A potentially important ammonite, vertebrate fossil or unusual association should remain unprepared for specialist assessment. Reversible consolidation should be used only where genuinely needed and after advice.
IDENTIFY YOUR FINDS
Need help identifying a fossil? Share clear photos, where you found it and its size with the community.
FURTHER READING
Jon Trevelyan (2022), Isle of Wight: Landscape and Geology review
National Trust, Tip of the Wight walk
Geologie und Paläontologie in Westfalen 51, Lewesiceras account, p.86
Hopson, Wilkinson and Woods (2008), Lower Cretaceous stratigraphical framework
English Nature (2003), Compton Chine to Steephill Cove SSSI citation
ACCESS RIGHTS
Rocken End lies in the Compton Chine to Steephill Cove SSSI. Use established public paths and observe current National Trust and site notices. The protected designation does not itself grant collecting rights. Concentrate on loose, already weathered material; obtain the relevant permission before any excavation or work on an exposure.
It is important to follow our ‘Code of Conduct’ when collecting fossils or visiting any site. Please also read our ‘Terms and Conditions’.
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