Burton Cliff combines towering Bridport Sand cliffs with a thin but exceptionally fossiliferous cap of Inferior Oolite limestone. Detached limestone can contain ammonites, sponges, echinoids and shells, but the cliffs are dangerously unstable: their geological interest is best appreciated from well outside the rockfall zone.
FIND FREQUENCY: ♦♦ to ♦♦♦♦♦ – Variable availability in detached limestone; rich historical fauna does not guarantee finds.
CHILDREN: ♦♦ – Burton Cliff is unsuitable for a casual family collecting stop because of sudden rockfalls.
ACCESS: ♦♦♦♦ – Hive Beach has established parking and access; the shore beneath Burton Cliff is tide- and condition-dependent.
TYPE: – Detached Inferior Oolite material, with observation of sandstone and limestone from a safe distance.
DIRECTIONS
♦ Use Hive Beach National Trust car park off Beach Road, Burton Bradstock, DT6 4RF, then the signed beach access. The original guide notes the nearby café and toilet facilities; check current opening arrangements.
♦ The historical village approach follows the footpath east of the River Bride; check the current signed route before using it. The western beach approach is tide-dependent and is not a default family walk beneath Burton Cliff.
♦ Original geological locality reference: 50.69608°N, 2.72253°W. This is not a verified parking or descent point.
DOWNLOAD THE UKF BOOKLET TO FOSSIL HUNTING AT BURTON BRADSTOCK
FOSSIL HUNTING
Begin by recognising the rock: most of Burton Cliff is fine sandstone, but the best-known ammonites come from the much harder, shelly Inferior Oolite limestone that caps it. Examine naturally detached material only where it can be reached well away from the cliff and recent falls. Look across weathered surfaces for curved ribs, chamber outlines and shell edges, then check the sides of a loose fragment. A partial coil can be worth keeping with its matrix even when no complete ammonite is visible.
The published Burton succession includes Parkinsonia parkinsoni and Strigoceras truellei in the Truellei Bed, Bed 13b. This is hard limestone with pale ooids and small dark grains, and good fossils can remain firmly locked into it. Nearby Bed 13c can instead contain decalcified internal moulds. The contrast matters when searching: a shell-shaped hollow or weathered cast may be the fossil rather than an empty patch to discard. Parkinsonia bomfordi has its type horizon in Burton Cliff’s Bed 14. These are useful named examples from the succession, not a promise that an unprovenanced ribbed fragment can be identified to species.
For older material, the sandy Scissum Bed, Bed 6, contains Tmetoceras scissum and Leioceras. Keep the sandy matrix attached and do not assign it automatically to the main Bridport Sand cliff below. The latter generally offers fewer body fossils; belemnite guards survive better than many ammonite shells, which commonly remain only as moulds. Branching burrows in the sandstone are trace fossils, recording animals moving through sediment rather than parts of their bodies.
Look beyond ammonites. The marly Sponge Bed, Bed 15, is rich in sponge fragments and accompanied by echinoid debris, brachiopods and bivalves. Weathered limestone can reveal shell sections and small skeletal pieces before a recognisable whole fossil appears. Brown, laminated “snuffboxes” are another characteristic feature, but these iron-rich coated grains are not ammonite nodules to crack in search of a shell. Their layered growth around an original nucleus records conditions on the ancient seabed.
Fossil abundance in the rock is not the same as availability on a visit: suitable detached limestone may be scarce, and intact, well-preserved ammonites require more luck than small shell fragments. Some faunal lists were supplemented from nearby Freshwater Caravan Park; retain that distinction when using the detailed log. Rolled fossils and younger fissure fillings complicate bed identification, so photograph the matrix and record a horizon only when established. Follow the current collecting code and National Trust guidance. Do not approach new slips, climb fallen debris or hammer the cliff; easy access at Hive Beach does not make Burton Cliff safe.
A chronological record of geological research and discoveries associated with Burton Bradstock.
1856–1863 – Early published cliff sections
Thomas Wright and Henry Day published early accounts of the Burton succession, establishing the foundations for later interpretation of the condensed ammonite-bearing beds.
1910 – Buckman’s bed framework
S. S. Buckman described and named horizons including the Rusty or Foxy Bed and the Scroff; later work revised the extent and interpretation of several of his divisions.
1928–1930 – Richardson’s detailed succession
L. Richardson documented the Burton Bradstock district and helped establish the bed framework subsequently used for the coastal section.
1969 – Modern revision of the log
Hugh Torrens revised the section and its numbering. The later numbered log retains that framework, reversing the order used in the earlier Richardson account.
1975 – Burton Limestone defined
C. F. Parsons introduced Burton Limestone for the limestones between the Astarte and Zigzag beds, with Burton Cliff as the type locality of this useful local unit.
1990 – Snuffbox growth investigated
T. J. Palmer and M. A. Wilson investigated the laminated iron-rich oncoids and their encrusting organisms, developing an explanation involving growth on mobile seafloor clasts.
1991 – Faults and sedimentary fissures interpreted
Work by H. C. Jenkyns and J. R. Senior related unusual younger limestone infills to movement of the Bride Fault during deposition.
1995 – Bed-by-bed reassessment
The revised account by J. H. Callomon and J. C. W. Cope integrated the condensed ammonite succession with nearby Freshwater evidence and clarified its many breaks in deposition.
24 July 2012 – Fatal rockfall investigated
A major fall demonstrated the danger of the high sandy cliffs and their limestone cap. The investigation identified cliff structure, erosion, weathering and wet conditions as contributing factors; fresh debris is not a safe collecting platform.
GEOLOGY
The striking yellow face of Burton Cliff is mainly Bridport Sand Formation, deposited as fine marine sand during late Toarcian to Aalenian time. Some layers became more strongly cemented by carbonate than others, producing the alternating harder bands and softer sand seen in the cliff. Fresh sandstone can be grey beneath its oxidised yellow surface. Burrowing animals disturbed the sediment, leaving trace fossils, while dissolution removed many originally aragonitic shells; this helps explain why an ammonite may survive as a mould and a calcitic belemnite guard can remain comparatively robust.
The thin Inferior Oolite limestone cap tells a very different story from the thick sands beneath. Sediment accumulated slowly on a submarine structural high and was repeatedly interrupted by erosion and reworking. Consequently, a short rock succession represents a long and discontinuous interval of Middle Jurassic time. Iron-stained surfaces, coated grains and rolled fossils mark some of those interruptions. Younger sediment also entered fissures, so the ages of a fossil, its surrounding filling and the older rock enclosing that filling need not match.
The cap is therefore best understood as a succession of distinct fossil-bearing horizons rather than one ammonite bed. Hard limestones, marly partings and sponge-rich intervals preserve different assemblages and respond differently to weathering. The numbered coastal log below keeps those differences and the missing intervals explicit. BGS treats the Wessex Inferior Oolite as an indivisible group; local names such as Burton Limestone remain useful without being promoted here to formal formations. The overlying basal Fuller’s Earth Formation belongs to the Great Oolite Group and is separate from the younger Frome Clay elsewhere along the coast.
The detailed geological succession and important exposure limits at Burton Bradstock.
Burton Cliff combines a thick sandy cliff with an exceptionally condensed Middle Jurassic limestone cap. The numbered succession below follows the published Burton Cliff GCR log; thicknesses are those of that section, not promises of present-day exposure. Its fossil list was partly enhanced from nearby Freshwater Caravan Park, so a species in that synthesis is not proof of an individual find at Burton Cliff.
LIAS GROUP
The older part of the exposed succession belongs to the Lias Group.
Bridport Sand Formation
These marine fine sands and cemented sandstone bands form the main cliff. The upper beds cross from the Toarcian into the Aalenian; the formation is not wholly confined to the Lower Jurassic at this section.
Age: Toarcian–Aalenian
Beds 1–3 — upper sandy succession
Yellow, slightly micaceous sand with burrowed, calcareous concretions. The recorded upper package is 1.50 m; the underlying unnumbered sands were seen through 30–40 m. Pleydellia aalensis places the uppermost Toarcian fauna below the next bed. The underlying 30–40 m is an observed cliff interval, not a total regional formation thickness.
Bed 4a — weakly cemented sandstone
Approximately 0.20 m of fine-grained, weakly calcareous, locally concretionary sandstone rests on an uneven base. The Toarcian–Aalenian boundary is placed at the base of Bed 4 in the GCR interpretation.
Bed 4b — cemented sandstone
A 0.25 m hard, highly calcareous, fine sandstone carries burrows and pipes. Fossils are sparse apart from local concentrations of Leioceras opalinum near its top; Pachylytoceras torulosum and rare Tmetoceras scissum are recorded. Its lower parting is indistinct.
Bed 5 — Rusty or Foxy Bed
A thin brown sandy marl, approximately 0.05 m thick, is somewhat laminated and contains ammonites and brachiopods. It grades downwards into Bed 4. The GCR places the formation boundary at its top; older authors drew the boundary at different levels, so bed numbers must accompany historical correlations.
INFERIOR OOLITE GROUP
The condensed succession is formally treated by BGS as an indivisible group in the Wessex Basin. The local bed names below retain the GCR numbering, beneath that group-level framework.
Age: Aalenian–earliest Bathonian
Bed 6 — Scissum Bed
Hard, sandy, massive limestone 0.45–0.50 m thick contains abundant ammonites, including Leioceras and Tmetoceras scissum, large bivalves and fossil wood. Some descriptions call the same rock a highly calcareous sandstone. Its position at the base of the Inferior Oolite follows the GCR convention rather than all historical schemes.
Bed 7 — Yellow Conglomerate
A 0.05 m marly limestone weathers yellow and contains rolled ammonites, pebbles and numerous belemnites, alongside less worn Graphoceras limitatum. Its uneven erosional base omits intervals represented only by reworked fossils; these older shells do not date the host bed directly. The GCR identifies the omitted Murchisonae and Bradfordensis zones at the basal non-sequence; ammonites from them can occur reworked in Bed 7.
Bed 8 — Snuffbox Bed
This impersistent blue-grey marly limestone is up to 0.10 m thick. Large limonitic ooids and laminated iron-rich oncoids occur with echinoid debris. The oncoids accumulated around nuclei on an intermittently disturbed seafloor; their complex growth should not be reduced to a simple fossil or a uniformly algal origin.
Bed 9 — lower Red Bed
A 0.20–0.25 m ooidal, biodetrital limestone weathers olive-grey and contains crinoid and echinoid debris. Its ammonite fauna includes Emileia, Otoites, Sonninia and Stephanoceras; large bivalves and gastropods occur. The richer weathered subdivisions at Freshwater Caravan Park are a separate exposure, not an extra Burton Cliff log. The basal non-sequence omits the Ovalis and Laeviuscula zones in the GCR interpretation.
Bed 10 — upper Red Bed
Two hard limestone courses total 0.30–0.50 m. Coarse bioclastic packstone is thoroughly burrowed, with large irregular vertical burrows highlighted by red limonite; its fauna is comparatively sparse. Stromatolitic crusts occur at the base, while its upper surface is an important hardground and erosional boundary.
Bed 11 — Red Conglomerate
Up to 0.15 m of irregular iron-rich ooidal limestone occupies pockets in the eroded surface below. Rolled, limonite-coated fossils and pebbles alternate with patches containing less worn fossils. This is a composite deposit rather than a single uniformly deposited bed.
Bed 11a — oldest conglomerate component
The oldest component is well-bedded but bioturbated iron-rich oolite with ammonites including Dorsetensia, Sonninia, Stephanoceras and Normannites. It belongs near the Sauzei–Humphriesianum zonal transition. No separate thickness is established for this component.
Bed 11b — younger pockets
Soft white limestone occupies small pockets and contains Leptosphinctes, Spiroceras and Strenoceras. Its fauna indicates the Polygyralis Subzone. These infills postdate the oldest component rather than representing an ordinary overlying sheet of uniform thickness.
Bed 11c — youngest fissure infill
White limestone in fissures contains Cadomoceras, Garantiana, nautiloids, brachiopods and echinoids. It represents the Garantiana Zone and was historically called the White or Nautilus Bed. Synsedimentary faulting helps explain this younger sediment within older limestone.
Bed 12 — Astarte Bed
Only about 0.10 m thick, this marly, densely iron-ooidal limestone has a diverse fauna ranging from worn encrusted shells to delicate ammonites. The common astartid is Neocrassina modiolaris; Garantiana, Parkinsonia rarecostata, gastropods and small solitary corals are recorded. A conspicuous stromatolitic crust occurs beneath its erosional base. Its basal erosion surface is historically termed the Vesulian Unconformity.
Beds 13–16 — Burton Limestone
This useful local lithostratigraphic name covers the bioclastic limestones and marly partings between the Astarte and Zigzag beds. It is retained as a named informal interval here, not promoted to a BGS formation or member. The constituent beds differ markedly in preservation and fossil content.
Bed 13a — lower marly limestone
About 0.10 m of marly biomicritic packstone or wackestone contains large pale-weathering ooids, more abundant downwards. It is less fossiliferous than 13b, but includes Bigotites, Parkinsonia and belemnites.
Bed 13b — Truellei Bed
Hard biosparite, 0.15–0.20 m thick, has scattered pale ooids and characteristic dark grains. Well-preserved ammonites include Strigoceras truellei, Parkinsonia parkinsoni, Bigotites and Cadomites. Thick-shelled bivalves, echinoids, gastropods and nautiloids occur. Fossils can be difficult to separate from the hard matrix.
Bed 13c — upper marly packstone
Approximately 0.30 m of fine biomicritic, locally ferruginous packstone contains limonitic pockets. Ammonites, including Lobosphinctes, Oxycerites and Parkinsonia, occur as decalcified internal moulds. Brachiopods including Sphaeroidothyris sphaeroidalis range through Bed 13.
Bed 14 — echinoderm-rich limestone
This 0.40 m coarse biodetrital limestone is divided by an undulating parting into two courses. Echinoid debris is prominent; ammonites include Parkinsonia bomfordi, whose type horizon is here. Nautiloids, brachiopods, bivalves and sponges occur. The courses are labelled 14a and 14b; the Bomfordi Subzone boundary is placed at the base of 14b. Neither course has a separately justified thickness.
Bed 15 — Sponge Bed
A variable 0.35 m marly limestone comprises several courses separated by thin marls, with a more limonitic marl at the top. Calcareous sponge fragments dominate the coarse debris. Echinoids, bryozoans, crinoids, brachiopods, bivalves and occasional poorly preserved Parkinsonia accompany them.
Bed 16 — upper massive limestone
Three courses of pale, hard, bioclastic and bioturbated limestone total approximately 0.65 m. Fossils are comparatively sparse. This forms the upper part of the informal Burton Limestone beneath the condensed Bathonian beds.
Bed 17 — Zigzag Bed
A roughly 0.15 m nodular, hard limestone has blue interiors and local pyrite or limonite. Its condensed ammonite assemblage includes Morphoceras, Oxycerites, Parkinsonia, Procerites and Zigzagiceras. It belongs to the earliest Bathonian Zigzag Zone.
Bed 18 — The Scroff
An impersistent rusty marl, 0.05–0.15 m thick, represents the reworked upper part of the Zigzag interval. Belemnites, brachiopods and poorly preserved, sometimes serpulid-encrusted ammonites occur. The name comes from local quarrying usage, not a formal formation.
GREAT OOLITE GROUP
The younger mudstone succession belongs to the Great Oolite Group.
Fuller’s Earth Formation
Only the basal cliff-top interval is represented in the measured coastal section; regional full thicknesses are not applicable.
Age: Bathonian
Bed 19 — basal Fuller’s Earth
Grey, slightly silty and calcareous clay was seen to 5 m above the limestone. Its fauna is poor, though Bositra is recorded. This is the Fuller’s Earth Formation; Frome Clay is a distinct younger unit elsewhere along the coast.
References
Bgs Burton Rockfall
Bgs Dorset Memoir
Bgs Middle Framework
Gcr Burton
Nt Hive
Nt Hive Safety
West Code 2023
SAFETY
Sudden rockfall may occur in any weather. Stay well away from cliff bases and edges; never climb fresh debris. Check tides and waves. Hive Beach shelves steeply and is not lifeguarded. Neither a helmet nor watching for movement makes the rockfall zone safe.
EQUIPMENT
Take sturdy footwear, tide information, a hand lens, camera, wrapping and rigid boxes. Do not make heavy hammering the purpose of the visit. Any work on detached material must comply with current permissions and take place away from cliffs and other people.
CLEANING AND TREATING
Hard bioclastic limestone usually needs controlled mechanical preparation under magnification. Leave matrix supporting the fossil and stop if rock and shell break together. Vinegar and other household acids can damage calcitic shells and sponges. Leave potentially important material unprepared for expert assessment.
IDENTIFY YOUR FINDS
Need help identifying a fossil? Share clear photos, where you found it and its size with the community.
FURTHER READING
Burton Cliff and Cliff Hill Road: detailed GCR account
BGS Middle Jurassic framework
BGS Burton Bradstock rockfall study
Burton Cliff geological field guide
National Trust beach safety
ACCESS RIGHTS
Use the current West Dorset collecting code where its landowner scope applies. Ordinary visitors should search detached material on the beach, stay out of cliffs and falls, and report potentially significant finds. Follow the applicable owner’s management guidance rather than assuming designation alone establishes every collecting rule. National Trust expressly asks visitors not to visit new slips.
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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