West Bay’s East Cliff is a striking exposure of yellow Bridport Sand, where harder sandstone bands stand out against softer sand. Belemnites, occasional ammonite moulds and burrows and shell remains reward close observation of safely accessible material, although fossils are generally less plentiful than at nearby Burton Bradstock.
FIND FREQUENCY: ♦ – Generally sparse belemnites, shells, ammonite moulds and burrows; loose limestone may have uncertain provenance.
CHILDREN: ♦♦♦ – Use the open beach with close supervision and keep well away from cliff bases. Nearby town facilities do not make the cliff zone safe.
ACCESS: ♦♦♦♦♦ – Harbour-side parking and promenade access are straightforward; check local notices and sea conditions.
TYPE: – Open-beach observation and permitted loose material beneath unstable sandstone cliffs.
DIRECTIONS
♦ From the Bridport roundabout follow signs to West Bay. Dorset Council lists East Beach car park, DT6 4EW, beside the relevant eastern side of the harbour.
♦ Follow the public promenade or signed beach access. Harbour facilities are nearby, but do not plan a compulsory beach traverse from Burton Bradstock; cliffs and sea conditions can interrupt it.
♦ Original geological locality reference: 50.70866°N, 2.75905°W. This is not a verified parking or descent point.
FOSSIL HUNTING
The Bridport Sand is generally fossil-poor. Belemnites, shells and occasional ammonite moulds occur in carbonate-cemented bands; dissolution of the original aragonitic shells often leaves an incomplete impression rather than a robust shell. Look at naturally weathered surfaces only where the shore is safely accessible and the owner’s rules permit it.
Burrow systems, including Thalassinoides, can be more conspicuous than body fossils. The original guide records these in honeycomb-weathered sandstone. Their branching shapes record activity within the ancient seabed; honeycomb weathering itself is a later weathering texture.
Iron-rich, concentrically coated structures traditionally called “snuffboxes” occur in limestone debris attributed to the thin Inferior Oolite cap. Shell fragments may form their centres, but a snuffbox is a rock structure rather than a fossil species. Record loose examples as having uncertain source beds. Do not approach recent falls or climb the cliff to reach the limestone.
A chronological record of geological research and discoveries associated with West Bay — East Cliff.
1967 – Sandstone rhythms investigated
Davies’ sedimentological work examined the alternating friable and cemented sandstones, including the East Cliff–Burton coast. It provides an explanation for the striking banded appearance rather than a record of a single fossil discovery.
2017 – Major East Cliff rockfalls documented
Field photographs and observations recorded major falls that affected the cliff-top path and reached the edge of the golf course. The episode demonstrates that serious rockfalls are a continuing hazard.
GEOLOGY
East Cliff exposes the Bridport Sand Formation of the Lias Group, with weakly cemented fine sand alternating with harder carbonate-cemented sandstone. Fresh rock can be blue-grey; weathering of iron-bearing minerals gives the cliff its yellow-brown colour. The local succession extends from late Toarcian into earliest Aalenian time, crossing the conventional Lower–Middle Jurassic boundary.
A thin Inferior Oolite limestone cap survives high above the shore. Its condensed marine deposits contrast with the sand beneath, but the much fuller Burton Cliff log describes a separate locality. The old guide’s small fault-associated Fuller’s Earth outcrop remains attributed cliff-top context pending modern verification; Fuller’s Earth and Frome Clay are not interchangeable names.
Quaternary valley fill, sand-filled fissures and near-surface movement towards the Brit valley complicate the cliff. These features help explain the landscape and instability without allowing prediction of individual rockfalls. The detailed inventory distinguishes them from the Jurassic marine beds.
The detailed geological succession and important exposure limits at West Bay — East Cliff.
This is primarily a Bridport Sand exposure, best understood from the open beach at a safe distance. The following inventory distinguishes actual local features from inaccessible cliff-top context and younger superficial deposits.
LIAS GROUP
The principal cliff belongs to the Lias Group. “Upper Lias” is useful historical terminology, not a modern formation.
Bridport Sand Formation
The yellow, nearly vertical East Cliff exposes alternating weakly cemented fine sand and harder carbonate-cemented bands. The local source describes approximately 43 m of formation; cliff height is a separate measurement. Deposition spans late Toarcian into earliest Aalenian in Dorset, so not every topmost layer is Lower Jurassic.
Age: Late Toarcian–early Aalenian
Friable sand and cemented sandstone rhythms
Repeated soft and hard bands reflect differences in sediment supply, carbonate content and early cementation. Fresh interiors may be blue-grey; weathering of iron-bearing minerals produces the familiar yellow-brown colour. The rhythms are not individually numbered in the sources read.
Burrowed and shell-bearing horizons
Thalassinoides, belemnites and occasional ammonite moulds occur. Dissolution removed many originally aragonitic shells, so a poorly defined mould may be all that remains. Fossils are sparse overall; no reliable species-to-bed inventory has been established for every band at East Cliff.
Upper transition towards limestone
The harder bands become more closely spaced toward the top, preceding the condensed limestone succession. This change can be observed from a safe distance and is not a reason to approach or climb the cliff.
INFERIOR OOLITE GROUP
A thin limestone cap is present locally high above the beach. In this Dorset area the group is not divided into a formal “Inferior Oolite Formation”. The much fuller Burton Bradstock bed log describes a separate locality.
Age: Middle Jurassic
Iron-rich oncoids, historically “snuffboxes”
Iron-coated, concentrically built structures occur in limestone material reported from the cliff cap. Shell fragments may form their nuclei. A loose beach example has uncertain exact horizon unless its source can be demonstrated; a continuously exposed collecting bed is not established.
Fuller’s Earth Formation: restricted cliff-top context
The original guide records a fault bringing Fuller’s Earth into a small cliff-top outcrop. This historical observation awaits modern map verification. It is not Frome Clay, and the precise original distance of 155 m from the river mouth has not been independently verified. Fuller’s Earth belongs to the Great Oolite Group, not the preceding Inferior Oolite Group; the local outcrop remains an attributed historical observation rather than a modern confirmed section.
Age: Middle Jurassic; exact local stage not assigned
Quaternary valley-fill deposits
A small dry valley intersects the eastern part of East Cliff. The described fill includes sandstone breccia, sand and a possible old soil horizon. A periglacial origin is a published interpretation, not a demonstrated date for each layer.
Age: Quaternary; precise chronology unconfirmed
Sand-filled fissures and cambering
Open joints contain sand or angular sandstone rubble. Step-like displacements near the harbour end have been interpreted as near-surface movement toward the Brit valley, rather than all being deep tectonic faults. This helps explain instability but cannot predict when the next fall will occur.
References
Bgs Dorset Memoir
Bgs Middle Framework
Council Westbay Parking
West East Cliff
SAFETY
Keep well away from cliff bases and edges, including freshly fallen debris. Rockfalls can occur without warning in dry as well as wet weather. Check tides, wind and swell and remain on the open beach with a clear return route. Harbour facilities and easy parking do not make the cliff zone suitable for children.
EQUIPMENT
Take a hand lens, camera and notebook, with wrapping and a small rigid box only for separately permitted loose finds. Sturdy footwear and tide information are more useful than a heavy hammer at this generally fossil-poor site.
CLEANING AND TREATING
For already lawfully collected sandstone material, begin with gentle dry brushing and test stability before further work. Friable sand and hollow moulds can crumble. Keep limestone finds labelled as loose with uncertain bed provenance unless their source is established; avoid household acids and routine coatings.
IDENTIFY YOUR FINDS
Need help identifying a fossil? Share clear photos, where you found it and its size with the community.
FURTHER READING
East Cliff geological field guide
BGS south Dorset memoir
BGS Middle Jurassic stratigraphical framework
Dorset Council East Beach parking
ACCESS RIGHTS
A public beach visit does not authorise hammering cliffs, extracting bedrock or taking material from private land. Until current local collecting terms are confirmed, observe and photograph; take small loose finds only where the owner’s stated policy permits it. Never assume World Heritage or SSSI status itself is permission.
Protected-site information: SSSI Information – West Dorset.
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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