Gilberts Grave is a wooded railway-cutting locality associated with Clypeus ploti echinoids and fossiliferous Middle Jurassic limestone. Its weathered rock faces illustrate the shelly Clypeus Grit of the Cotswolds. Access must be confirmed before a visit: closure has been reported at Chedworth Nature Reserve, and the current route and collecting terms remain unverified.
FIND FREQUENCY: ♦♦ – The locality has documented echinoid interest, with shell fossils in the limestone. This describes geological interest, not current collecting availability or permission.
CHILDREN: ♦ – Do not plan a family visit until the route is confirmed open and suitable. High embankments, loose rock and woodland hazards need close supervision.
ACCESS: ♦ – Current access is unconfirmed. Reports concern closure of Chedworth Nature Reserve; their exact boundary has not been established for this guide exposure.
TYPE – Wooded, disused railway-cutting exposures and loose limestone debris; observation-led unless the current land manager explicitly permits more.
DIRECTIONS
♦ Before setting out, ask Gloucestershire Wildlife Trust or the current land manager whether the relevant railway-cutting route is open. Check the exact approach and any temporary restrictions. Do not enter through a closure or bypass a gate, fence or warning sign.
♦ The locality is approached from the Tunway Gate area, northwest of Chedworth Woods, where the minor road south of Compton Abdale crosses the former railway. This identifies the general approach, not a confirmed parking place or permission to enter.
♦ The former railway includes both cuttings and high embankments. Use only a route that the manager confirms is open; do not follow the railway simply because it appears on a map or an online walking route.
♦ The named Road Bridge, Tumulus, Long and Tunnel cuttings in geological papers are distinct exposures. A coordinate near the approach does not establish which face is accessible, privately owned or included in a closure.
♦ Approach reference: 51.82764°N, 1.93243°W. It does not mark a verified safe standing point, present parking permission or the exact photographed bed.
FOSSIL HUNTING
Before visiting, contact the landowner to check that access to the cutting is permitted and whether you may collect loose fossils. Closure has been reported at Chedworth Nature Reserve, and permission for this cutting remains unconfirmed. Until that’s clarified, leave fossils in place.
The clearest independently documented fossil associated with the name Gilberts Grave Cutting is Clypeus ploti, the sea urchin often called a Chedworth bun or poundstone. Its broad rounded test can be recognised by the five-part arrangement of the ambulacral areas where surface detail survives. A broken or worn specimen may show only a rounded outline or internal mould. Shape alone is not enough to name every loose lump, and weathered shells can be difficult to distinguish from their surrounding limestone.
The photographs also illustrate the practical importance of preservation. A fossil may retain original shell, survive as a mould after shell material has dissolved, or remain partly enclosed in a resistant block. Those different states explain why some specimens reveal fine detail while others look smooth or incomplete. Examine them with a hand lens and oblique lighting rather than scraping the rock. An apparently simple shell outline may carry delicate ribs or attachment marks.
Brachiopods and bivalves are useful groups to compare. Brachiopods commonly show a symmetrical outline along the middle of an individual valve; bivalves have their own range of hinges, growth lines and unequal shell forms. Make several photographs, including the hinge region where visible, before suggesting a name. A shell in a loose block cannot be assigned to the bed above it solely from its position on the slope.
Published studies demonstrate substantial differences among the nearby Chedworth railway sections. The Road Bridge soft bed, for example, has a fauna unlike some of the Long and Tunnel cutting samples. Those research lists provide comparison material, but they are not a checklist of species verified at every face called Gilberts Grave. Keeping the section name, rock texture and preservation together is more useful than making an unsupported precise identification.
For any noteworthy fossil, record a scale, a close view and a wider photograph of its setting from a safe path. Note whether it is attached or loose. Leave unusual material undisturbed and send its location and photographs to the manager for advice. Do not clear vegetation, dig into scree, undercut limestone or climb to reach a fossil.
Significant discoveries and research
1994–1995 – Separate railway sections logged
BGS surveyors recorded several named Chedworth railway exposures and their structural relationships. These logs provide a framework for comparing the cuttings, without establishing that every measured section is the face illustrated here.
2005 – Gilberts Grave’s echinoid interest documented
Gloucestershire Geology Trust’s report for the Cotswolds AONB Conservation Board explicitly listed Gilberts Grave Cutting for Clypeus ploti, linking the locality name to its characteristic sea-urchin fossils.
2005 – A distinct nearby soft-bed assemblage studied
Angseesing and Price investigated a fossil-rich interval at Road Bridge Cutting and compared it with Cleeve Hill. Their work showed why samples from separate Chedworth sections should retain their own provenance.
2022 – Chedworth faunas compared across five horizons
Angseesing compared separately sampled parts of the railway succession, demonstrating differences in fossil communities within the Clypeus Grit. These are named-section research results rather than a single fauna assigned to Gilberts Grave.
GEOLOGY
Gilberts Grave is associated with the Clypeus Grit, a fossiliferous limestone member of the Salperton Limestone Formation within the Inferior Oolite Group. The Cotswolds’ Middle Jurassic rocks accumulated in shallow marine environments where carbonate grains and shell debris formed much of the sediment. Studies of the Chedworth railway reserve place their examined Clypeus Grit in the late Bajocian Parkinsoni Zone. That regional-local context is more secure than assigning a numerical age to an individual photographed fossil.
The rock commonly contains ooids, peloids and broken shells. Ooids are coated carbonate grains; peloids are small carbonate particles without the same conspicuous concentric structure. Larger irregular coated or composite grains also occur in the Chedworth succession. These grains, their muddy or cemented matrix, and the included fossils give the limestone its variable appearance. Some surfaces weather into firm blocks, while softer material breaks down to granular debris around them.
The Clypeus Grit is therefore not one uniform fossil bed. The 2005 Road Bridge study distinguished six beds within its composite section, including a particularly soft, fossil-rich interval. Later work compared several separate Chedworth horizons and found differences in their shell assemblages and preservation. These observations explain why nearby exposures can look and behave differently. They do not prove that the same six beds, or the same sampled fauna, can be traced into this guide’s photographed cutting.
The wider railway also exposes older Inferior Oolite limestones. BGS logs distinguish the Upper Trigonia Grit, Notgrove and still older members at specified sections, with faults locally placing different levels close together. Bored and oyster-covered rock surfaces mark pauses or breaks in deposition in some of those sections. Such contacts must be tied to their documented location: neither a nearby published thickness nor a formation boundary can safely be transferred to an unnamed face.
No measured thickness or complete sequence of formation contacts has been securely established for the precise Gilberts exposure illustrated here. The geological chart consequently identifies the documented limestone unit without constructing a composite from neighbouring cuttings. The detailed notes distinguish this local identification from the wider research context. Loose scree, soil and woodland cover are later surface materials; they are not additional named Jurassic beds.
The railway excavation made the rocks visible, but weathering, roots, falling blocks and vegetation continue to alter their exposure. Comparing fresh-looking and weathered surfaces from a safe position can help reveal shell moulds and bedding, while photographs taken at different scales show how fossils sit within the rock. Geological interest does not establish that a face is stable or that access is currently allowed.
Detailed geology and stratigraphy
Gilberts Grave names the railway-cutting locality illustrated here. The exact photographed face has not been securely matched to one of the separately named Chedworth sections in the geological literature. The following account identifies its documented limestone and fossil interest, while keeping neighbouring measured sections separate. No neighbouring log is treated as a measured Gilberts succession.
INFERIOR OOLITE GROUP
Salperton Limestone Formation
Clypeus Grit Member
Fossiliferous limestone; local thickness unmeasured
The locality is associated with the Clypeus Grit. At Chedworth, this member consists of variable shelly limestone containing ooids, peloids and larger composite grains. Differences in matrix and cementation produce both resistant limestone and softer, rubbly weathering intervals. A complete thickness, numbered-bed sequence and top or basal contact have not been established for the precise photographed face.
Clypeus ploti and other shell fossils
The Gloucestershire Geology Trust’s report for the Cotswolds AONB Conservation Board explicitly lists Gilberts Grave Cutting among localities for Clypeus ploti. That is the independently documented echinoid name used here. Brachiopod and bivalve material also occurs in the photographed limestone, but an exact species list cannot be produced by transferring every taxon recorded from other Chedworth cuttings.
Age and depositional context
The studied Chedworth Clypeus Grit has been assigned to the Parkinsoni Zone of the Upper Bajocian, within the Middle Jurassic. Carbonate grains, shell debris and marine invertebrates record a shallow-sea setting. The age is a published correlation for the Chedworth succession, rather than an ammonite identification made from the photographs.
Separately documented Chedworth exposures
The following research context explains variation along the railway. The named sections have their own locations, beds and collecting histories; they are not interchangeable descriptions of the face illustrated in this guide.
Road Bridge Cutting: six local beds and a soft interval
Angseesing and Price’s 2005 account combines two sections a few metres apart near the southern end of Road Bridge Cutting. It distinguishes six Clypeus Grit beds, A0–A5, with A1 the relatively soft interval. Most of that cutting is on private land north of the bridge; only the southernmost end lies within the reserve. The measured scheme cannot be assigned to the Gilberts photographs merely from a nearby approach coordinate.
Faunal variation among the railway sections
The 2022 study compared Road Bridge, Long Cutting, a basal Clypeus Grit bed, the upper transition beds and Tunnel Cutting as separate samples. Road Bridge’s soft bed had a distinctive mixture including Clypeus ploti and Holectypus depressus; the Long and Tunnel samples differed in their proportions of brachiopods and bivalves. This is evidence for variation among documented sections, rather than a combined Gilberts species list.
BGS measured sections and faults
The 1995 survey logged separate exposures at Tumulus Cutting and farther south along the railway. They include older Inferior Oolite members, the Upper Trigonia Grit and Clypeus Grit, with a fault at Tumulus placing different levels alongside each other. A separate report describes the railway near The Bratches northwest of the approach. Each log is tied to its stated coordinates; their thicknesses are not added into a single local column here.
Later surface material and exposure
Loose limestone debris, soil and vegetation cover parts of the cutting. They reflect weathering and slope processes after the Jurassic rocks formed, not additional named members. A loose fossil may have moved from its original layer, and a clear-looking face does not establish stability or present access permission.
References
Gloucestershire Geology Trust (2005), The Geological and Geomorphological Importance of the Cotswolds Area of Outstanding Natural Beauty, report for the Cotswolds AONB Conservation Board, p.9, Figure 5.
Sumbler, M. G. and Barron, A. J. M. (1995), Geological notes and local details for1:10,000 sheet SP01SE (Chedworth), BGS WA/95/73, Appendix1.
Morigi, A. N. (1995), Geological notes and local details for1:10,000 sheet SP01SW (Colesbourne), BGS WA/95/106, locality P.
Sumbler, M. G., Barron, A. J. M. and Morigi, A. N. (2000), Geology of the Cirencester district, BGS memoir for sheet 235.
Angseesing, J. P. A. and Price, W. (2005), “The Clypeus Grit Member (Salperton Limestone Formation, Middle Jurassic) of the Road Bridge Cutting, Chedworth, Gloucestershire”, Proceedings of the Cotteswold Naturalists’ Field Club 43(II), p. 156 onwards.
Angseesing, J. (2022), “Faunal comparison of some strata within the Clypeus Grit Member (Jurassic: Salperton Limestone Formation) in Chedworth Railway Cuttings”, ibid. 49(I), p. 34 onwards.
SAFETY
Do not enter a closed reserve or pass barriers to inspect the rocks. Ash dieback and other woodland hazards have been reported in connection with the railway reserve. Falling branches, unstable trees and conservation work can make a route unsafe even when the old trackbed is easy to follow.
Keep away from the bases and edges of cutting faces and from embankment drops. Loose limestone, roots, leaf litter and wet ground can cause slips; rockfall can occur without warning. Do not climb, undercut or dig into a face, and keep children away from drops.
Do not enter railway tunnels, enclosed structures or private land. If a route is confirmed open, carry a map, charged phone, water and weatherproof clothing, tell someone your plan and turn back if conditions differ from the manager’s advice.
EQUIPMENT
For a manager-confirmed observation visit, sturdy footwear, a hand lens, camera and photographic scale are useful. Bring a map, water and suitable clothing. Leave digging, vegetation-clearance and rock-breaking tools behind; their use has no verified permission here.
CLEANING AND TREATING
Leave in-situ fossils and surrounding material undisturbed. Use changes in light and camera angle to see detail rather than scraping, brushing or wetting a rock face.
For an existing specimen with lawful collection provenance, preserve its locality information before preparation. Fragile shells and internal moulds in crumbly matrix may be damaged by soaking or vigorous brushing. Keep uncertain material dry and seek identification and preparation advice before using acids, abrasives or powered tools.
IDENTIFY YOUR FINDS
Need help identifying a fossil? Share clear photos, where you found it and its size with the community.
FURTHER READING
Gloucestershire Wildlife Trust: current enquiries
Chedworth Parish Council: reserve-transfer proposal, April 2021
Cotswolds geological importance: fossil sites and Clypeus ploti
BGS: separately logged Chedworth railway sections, 1995
Road Bridge Cutting: a separate Clypeus Grit study
Chedworth railway cuttings: separate faunal comparisons, 2022
ACCESS RIGHTS
Current access to the exact cutting and permission to remove fossils have not been verified. Closure has been reported at Chedworth Nature Reserve; the published information available here does not establish the exact boundary or present status of every adjoining railway section. Confirm the route with Gloucestershire Wildlife Trust or the current manager before planning a visit, and comply with all on-site closures.
Parish council records describe a proposed transfer of reserve land from the Trust, but those discussions do not establish a completed ownership change. Geological papers also distinguish reserve land from privately owned parts of Road Bridge Cutting. Neither history nor a map label grants permission to enter or collect.
Leave fossils, scree, vegetation and rock faces undisturbed unless the relevant land manager has expressly authorised a particular activity. Permission granted for a scientific study is specific to that work. Do not clear exposures, hammer bedrock or assume that loose material may be removed.
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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