Seaford Head’s chalk foreshore is noted for echinoids, especially in the beds around Hope Gap, although many specimens are worn or incomplete. Its flints, marls and hardgrounds record a changing Late Cretaceous succession along the coast. Hope Gap steps are closed: the geological account is not a route to the shore.
FIND FREQUENCY: ♦♦♦♦ – Echinoids and other chalk fossils occur in places; conditions and horizons control what is visible.
CHILDREN: ♦♦♦ – The foreshore is uneven, slippery and strewn with boulders; children need close supervision.
ACCESS: ♦♦♦♦ – South Hill Barn serves the cliff-top reserve. Parking charges apply and the former Hope Gap beach descent is closed.
TYPE: Chalk platform and loose blocks; do not hammer the cliffs.
Hope Gap steps are closed because cliff erosion has made them unsafe. Do not use the steps or bypass the barriers. This closure affects the staircase, rather than the whole Seaford coastline. Check Seaford Town Council’s current access advice before travelling.
DIRECTIONS
♦ Go past Seaford Head golf course along Chyngton Road and the narrow lane towards South Hill Barn car park. Parking charges apply; check the council’s current parking and access information.
♦ Hope Gap steps are closed. Do not follow the former descent to the beach or bypass the fencing. Use only open paths in the cliff-top reserve and follow current signs and closures.
♦ The beach has numerous boulders and an uneven, slippery foreshore. Check current access advice before travelling; no alternative shore descent is described here.
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FOSSIL HUNTING
The chalk shore around Hope Gap rewards close inspection, particularly of loose blocks and naturally washed surfaces. The well-known echinoid-rich foreshore lies west of the former Hope Gap steps, but those steps remain closed because erosion has made them unsafe. The fossil descriptions below identify the geological interest, not a route around the closure. Establish a permitted, safe approach before visiting and do not cross barriers or use improvised descents. Collecting conditions also depend on how much chalk is exposed between shingle and weed.
Echinocorys gravesi and Micraster are recorded in the upper Lewes Nodular Chalk around Hope Gap. Look for the difference between a domed, broadly oval Echinocorys and a heart-shaped Micraster, with its front groove. A complete-looking outline in a flat rock surface may be a section through a test rather than a whole specimen. Loose chalk with an intact curved shell surface is generally a better starting point for identification. Inspect all visible sides before deciding how much of the fossil survives, and do not remove it from the platform simply to check.
The fossil assemblage changes along the succession. Micraster decipiens and the large inoceramid bivalve Cremnoceramus crassus crassus are documented in the Beeding and Light Point interval. Higher Seaford Chalk contains shell-rich levels with Platyceramus mantelli and Volviceramus involutus. Keep these bed-related records separate when labelling finds. Broken inoceramid shell is worth noticing: its thickness, curved growth lines and prismatic fabric can remain visible even where the outline of the valve is lost. Keep the matrix with an unfamiliar shell fragment instead of dismissing it because it is incomplete.
Sea-urchin spines provide a different sort of find. A cidaroid spine may resemble a short decorated rod rather than a recognisable animal. The specialist Chalk collection illustrates a spine of Temnocidaris intermedia from the Beeding Beds at Hope Gap. Look for regular surface ornament and a shaped base on naturally exposed fragments; ordinary flint splinters do not acquire the same organised skeletal detail. Not every isolated spine can be named confidently, because different positions on one animal produce different shapes and related species can overlap.
Bryozoans make small shell-bearing pieces especially worth a second look. These colonial animals can form thin patches over a shell or other hard surface, with repeated tiny openings visible under magnification. Published examples include Pyriporella seafordensis from Hope Gap and Wilbertopora from Seaford. Keep the supporting shell and colony together, and avoid vigorous brushing: the small details needed to identify a bryozoan can be easier to remove than the surrounding chalk.
A productive search therefore works at two scales: scan larger loose blocks for echinoid tests and shell sections, then inspect selected weathered pieces with a lens for spines and encrusting colonies. Do not confuse the Seaford Chalk Formation name with proof that a specimen was collected at Seaford; many illustrated fossils from that formation come from other counties. Label your own finds with the actual part of this shore, whether they were loose or embedded, and any recognised marker bed. Leave cliff faces and fixed exposures undamaged, and keep unusual associations intact for specialist advice.
A chronological record of fossil discoveries and geological research at Seaford.
1900 – Fossil zones documented
Rowe’s coastal work tied fossil zones and marker horizons into a detailed Seaford Head succession.
1986 – Chalk framework established
Mortimore formalized a lithological framework in which Seaford Head supplied type sections for Seaford and Newhaven chalk units.
1997 – Chalk deformation studied
Detailed study of slumped chalk and shattered-flint laminae helped interpret early deformation and lateral correlation in the Hope Gap succession.
GEOLOGY
Seaford Head exposes a succession distributed geographically from Cuckmere Haven and Hope Gap through Splash Point to the western outfall. Upper Lewes Nodular Chalk is important around Hope Gap, with Seaford, Newhaven and finally lower Culver Chalk represented farther along the section. It is not one vertical stack visible at Hope Gap.
Around Hope Gap, the upper Lewes Chalk alternates between softer grey chalk and harder, locally red-stained nodular beds. Burrows filled with grey sediment cut the harder rock, and hardened sea-floor surfaces record interruptions and reworking during deposition. The Navigation hardgrounds contain reworked chalk fragments; the Cliffe and Hope Gap intervals record echinoids including Echinocorys gravesi and Micraster. Near Beeding Marl, folded soft chalk and disrupted flint laminae preserve evidence of submarine slumping rather than a uniform undisturbed layer.
The succeeding Seaford Chalk includes shelly Belle Tout beds with Platyceramus and Volviceramus, followed by whiter Cuckmere chalk that is generally less conspicuously rich in large fossils but contains abundant trace fossils. The Seven Sisters Flint Band marks a silicified branching burrow network at the transition between those informal packages. Higher sponge-bearing intervals and named flints continue the sequence. Farther west, the return of persistent marl seams identifies Newhaven Chalk; tubular and other burrow-shaped flints, shell-rich marls and sponge beds provide finer divisions before the lower Culver Chalk. These contrasts explain why fossil content changes markedly along the section.
Hardgrounds, slumped chalk, marl seams and distinctive flints allow individual horizons to be followed. The current BGS base of Seaford Chalk lies at the base of Shoreham Marl 2; older GCR wording places the boundary at the upper surface of the upper marl. The detailed account distinguishes these conventions.
Younger loess caps the cliffs at Hope Gap, and dissolution pipes farther west contain residual or infilled material. These features lie outside the Chalk bedrock hierarchy. Historical descriptions of exposures do not establish present-day access.
Detailed geology and stratigraphy of Seaford.
The scientific section is Seaford Head from Cuckmere Haven through Hope Gap to Splash Point and the western outfall. These progressively exposed beds are not all visible at Hope Gap. The Hope Gap beach steps are currently closed; the geology below is not an instruction to use them.
CHALK GROUP
WHITE CHALK SUBGROUP
Lewes Nodular Chalk Formation
Late Cretaceous; the locally exposed upper part spans the Turonian–Coniacian transition and lower Coniacian. Nodular chalk, hardgrounds, marl seams and flints occur around the anticline near Hope Gap and beneath the Castrum.
Upper Lewes overview
The following overview describes the principal bed packages; the detailed ascending marker sequence follows.
Navigation hardgrounds. Two hardened, mineralized and knobbly surfaces underlie the Navigation marls; intraclasts record reworking.
Navigation marls. Two marls, each about 0.05–0.07 m, are separated by about 0.5 m. The top of the upper marl defines the informal Navigation/Cliffe bed boundary in the GCR scheme.
Cliffe Beds and hardground. A distinct package above the Navigation marls. The nearby Cliffe and Hope Gap beds yield Echinocorys gravesi and Micraster in the GCR record.
Hope Gap Beds and hardground. Grey soft chalk alternates with red-stained nodular chalk, with grey sediment filling burrows in the harder component. The upper hardground, historically 20 m west of the steps, contains Cremnoceramus and marks the next informal package.
Beeding Marl and sheet-flint. A conspicuous sheet-flint approximately follows the streaky marl above the Hope Gap hardground. Overlying soft calcarenitic chalk, about 1.6 m locally, contains slump overfolds and laminae with shattered flint.
Beeding beds and carious flints. Above the slumped interval, conspicuous irregular flint bands can be followed laterally. Micraster decipiens and Cremnoceramus crassus crassus are recorded from the Beeding/Light Point interval.
Light Point hardgrounds and Beachy Head Sponge Beds. Iron-stained hardgrounds and sponge-bearing horizons preserve conspicuous Zoophycos traces overprinting older Thalassinoides burrow fills. Despite the geographic bed name, the observations described here are from the Seaford section.
Detailed upper Lewes markers — ascending order
This sequence returns to the low Navigation interval and works upwards through the individual markers to the Shoreham boundary.
Cuilfail Zoophycos Beds. A lower trace-fossil-bearing interval in the Navigation Beds is labelled in Figure 3.97 below the Navigation marls; its plotted vertical datum is not a separate thickness measurement.
Conspicuous Cliffe Flint Band. A prominent flint horizon lies within the Cliffe Beds below the Cliffe Hardground.
Lower Hope Gap slump bed. The lower of two separately labelled deformed chalk intervals lies below the Hope Gap Hardground.
Hope Gap Sheet Flint. The sheet-flint directly above the hardground separates it from the upper slumped interval.
Upper Hope Gap slump bed. A distinct deformed interval above the sheet-flint includes the soft calcarenitic chalk and shattered-flint laminae described in the text.
Lower Beeding conspicuous flint bands. Two separately plotted conspicuous flint horizons occur above the upper slump bed, below the carious-flint marker.
Beeding carious flint band. An irregularly hollowed flint band occurs above the lower conspicuous bands.
Conspicuous Beeding Flint Band. A higher named flint horizon lies below the Light Point hardgrounds and Beachy Head trace-fossil interval.
Shoreham marls and tubular flints. The paired marls enclose the Shoreham Tubular Flints. Current BGS places the Seaford base at the base of Shoreham Marl 2; older GCR prose uses the upper surface of the upper marl. The present account follows the BGS boundary definition, while preserving the older terminology when describing its log.
Seaford Chalk Formation
Late Cretaceous, Coniacian–Santonian. The type section is soft white chalk with conspicuous flint bands. Belle Tout, Cuckmere and Haven Brow are informal bed packages, not formal member bars.
Seaford Chalk overview
The principal packages are summarized first; the finer ascending lower-Seaford marker sequence follows.
Belle Tout marls 1–3. Three named marl sets, the first two resolved into lower and upper components in the detailed figure, are associated with abundant inoceramid shell debris. Platyceramus mantelli is recorded; Volviceramus involutus occurs in a band about 1.6 m below the Seven Sisters Flint Band.
Seven Sisters Flint Band. At TV 493978 just west of the Castrum, a 0.2–0.3 m thick silicified branching burrow network contains iron staining and sponges. It marks the field boundary into the Cuckmere package; a slightly higher shell-debris criterion is used in core logging.
Cuckmere flints and chalk. Relatively pure white chalk with few macrofossils but conspicuous trace fossils. Fossil abundance varies markedly between its beds.
Upper Cuckmere sponge beds. Two soft nodular iron-stained horizons occur towards the top; one is the historically named Barrois’ Spurious Sponge Bed.
Detailed lower Seaford markers — ascending order
The sequence below starts above the Shoreham boundary and proceeds through the split Belle Tout marls into the Cuckmere beds.
Basal Seaford sponge bed with Echinocorys. Figure 3.98 records a sponge-bearing horizon with Echinocorys above Shoreham Marl 2 and below the conspicuous double flint.
Conspicuous double flint. A paired flint marker lies below the lower Belle Tout Marl 1.
Belle Tout Marl 1 — lower. The lower component is a separately plotted marl, below a shell-rich interval with Platyceramus as labelled in the source figure.
Belle Tout Marl 1 — upper. A separate upper component overlies that lower shell-rich interval.
Belle Tout Marl 2 — lower. The lower of the second paired marl markers occurs above the Marl 1 pair.
Belle Tout Marl 2 — upper. The second upper marl lies immediately below the Marker Flint Band in the local figure.
Marker Flint Band. A distinct flint horizon above the Marl 2 pair and below the next shell-rich interval.
Belle Tout Marl 3. The third named marl occurs between intervals labelled with abundant Platyceramus.
Cuckmere Flint Band 1. Above the Seven Sisters Flint Band and a shell-rich horizon, the lower separately numbered Cuckmere flint is recorded.
Cuckmere Flint Band 2. The upper numbered flint is separated from Band 1 by an abundant Platyceramus interval; higher shell remains also occur within flint.
Glauconitic Cuckmere Sponge Bed. Figure 3.98 identifies this bed above the uppermost Platyceramus band and beneath the relatively barren Cuckmere chalk.
Michel Dean Flint. The lowest of a trio of semi-tabular flint bands; its top defines the base of the informal Haven Brow Beds. Cladoceramus undulatoplicatus appears at this level in the local record.
Baily’s Hill Flint. The next marker of the trio, with sporadic Cladoceramus recorded.
Baily’s Hill paired flints. Figure 3.100 resolves the Baily’s Hill marker into a pair, between Michel Dean and Flat Hill.
Flat Hill Flint. The highest of the trio, associated with abundant Cladoceramus and locally columnar flint structures.
Brasspoint Flint. First of four further conspicuous semi-tabular bands in the Haven Brow succession.
Weak marl with Cordiceramus entry. Above Brasspoint Flint, an almost imperceptible marl is associated in the figure with the first recorded Cordiceramus cordiformis.
Rough Brow Flint. A younger named semi-tabular marker above Brasspoint.
Short Brow Flint. The next marker in the ascending local succession.
Upper Haven Brow sheet-flint and shatter bed. A separately labelled sheet-flint and shattered interval occurs above Short Brow Flint; Conulus horizons and a Zoophycos level are plotted nearby.
Exceat Flint. Highest of the four named Haven Brow flint bands preceding the basal Newhaven marl succession.
Newhaven Chalk Formation
Late Cretaceous, Santonian–Campanian, exposed farther west towards Splash Point and beyond. Returning marl seams distinguish it from Seaford Chalk.
Newhaven Chalk overview
This overview introduces the lower bed packages. A separate ascending list below resolves their individual markers.
Buckle Marl 1 and Splash Point Beds. Buckle Marl 1 marks the base of Newhaven Chalk at Seaford Head; the lower informal package contains abundant Zoophycos-type flints. Lower Splash Point strata occur around the Friars Bay anticline, not beneath every Peacehaven cliff.
Buckle marl succession. Further marls overlie the basal seam; old descriptions of caves and access are geological context only, not safe-route directions.
Hawks Brow Flint. A marker with exceptionally large nodules within the lower package.
Brighton Five and Brighton Marl. Five interlacing marls occur in harder nodular chalk below the conspicuous closed marl seam. Brighton Marl marks the base of the informal Old Nore Beds.
Kemptown and Sheepcote Valley flints. Broad, scattered seams of horn-like nodules contrast with the more rounded and compact Friars Bay flint bands.
Friars Bay flints and marls. Friars Bay Marl 1 is laminated and shell-rich, over chalk with abundant inoceramid debris. The further local marl/flint markers are separately represented in the measured GCR figures; no unsupported thicknesses are assigned.
Micula-rich chalk and Rottingdean Marls. A hard white chalk rich in calcareous nannofossils and small cracks lies beneath the conspicuous paired Rottingdean marls.
Roedean marls. A conspicuous triple marl marker below Old Nore Marl, traceable through the lower Newhaven succession.
Old Nore Marl and underlying flints. A conspicuous clay-rich, volcanogenic marl lies above finger- and tube-shaped flints. It marks the base of the informal Peacehaven Beds and a significant break in deposition; the historical “2-inch” and “4-inch” names are not uniform measured thicknesses.
Detailed lower Newhaven markers — ascending order
The following list returns to basal Splash Point chalk, then proceeds through the Old Nore markers towards the Peacehaven Beds.
Buckle Flint and lower channel scour. The Buckle Flint lies above Buckle Marl 1. Higher in Splash Point chalk, a channel locally removes a marl; this is a lateral erosional feature rather than a continuous extra bed.
Splash Point slumped marls. Disrupted marl layers occur above Hawks Brow Flint and below the Brighton Five.
Kemptown marls. The figure distinguishes marl markers between Kemptown Flints and Sheepcote Valley Flint.
Friars Bay Marl 1. The lowest named Friars Bay marl succeeds the shell-rich chalk and is associated with the first numbered Friars Bay flint.
Friars Bay Flint 1. A distinct flint marker above the lowest Friars Bay marl.
Friars Bay Flint 2. A separately numbered flint marker below Friars Bay Marl 2.
Friars Bay Marl 2. The middle named marl follows the paired flints.
Friars Bay Marl 3. The highest numbered Friars Bay marl precedes Ovingdean Marl.
Ovingdean Marl. A separate marl above Friars Bay Marl 3 and below Black Rock Marl.
Black Rock Marl. A named marl below Saltdean Marl, historically correlated by Rowe and Brydone with their Black Rock marker.
Saltdean Marl. A separate marl below the Rottingdean pair.
Old Nore Sheet Flints. Sheet-flint markers occur in relatively flint-poor lower Old Nore chalk.
Old Nore Thin Marl. A thin marl precedes the Old Nore Tube Flints.
Old Nore Tube Flints. Tubular flints lie below the principal Old Nore Marl.
Old Nore Marl Pair. The separately labelled pair above the main Old Nore Marl belongs to the lower Peacehaven package.
Peacehaven Beds. A package of chalk, marl seams and large branching, Thalassinoides-shaped flints. It is an informal bed package within Newhaven Chalk, not a formal member.
Peacehaven Marl. The upper boundary of the package marks a change in the Echinocorys assemblage; the overlying interval is the informal Meeching Beds.
Meeching Beds and flints. Chalk with characteristic flint bands and changing echinoid forms. Bed names retain their local field usefulness as informal subdivisions.
Meeching Flint Zone. The distinctive flint-rich interval in lower Meeching chalk is separately labelled in Figure 3.102.
Meeching Triple Marls. A three-marl marker lies below the higher Meeching Marl Pair.
Meeching pair of marls and sponge beds. Two conspicuous marls, associated with red iron-stained sponge-rich layers, define the next break and the base of the informal Bastion Steps Beds.
Tavern Flints. Scattered mixed-size nodules, some tubular, lie below Telscombe Marl 1.
Telscombe Marl 1. Contains reworked chalk intraclasts. The historical fossil scheme records smaller Offaster pilula below and larger forms called Offaster pilula planatus above.
Telscombe Marls 2–4. Complete the four-marl marker set above Marl 1. Their separate local thicknesses are not supplied by the published account.
Black Rabbit Marl 1. A named marl above Telscombe Marl 4 and below the second Black Rabbit marl.
Black Rabbit Marl 2. The higher Black Rabbit marl lies immediately beneath the Arundel Sponge Bed in the figure.
Arundel Sponge Bed. An intermittent, red iron-stained sponge-rich layer above the Telscombe marl group.
Castle Hill Marls. Highest marls marking the local Newhaven/Culver boundary. They are weak at Castle Hill; lateral equivalence with Pepperbox marls elsewhere does not justify importing an external boundary log.
Culver Chalk Formation
The youngest chalk occurs towards the western end near the outfall, not at Hope Gap.
Tarrant Chalk Member
Only the basal member of Culver is relevant here.
Castle Hill flint succession. The local GCR log shows eleven numbered flint bands. Small sliding/lamination intervals occur between bands 3–4 and 5–6; they are not extra formal members or a complete Culver thickness.
The Seaford record includes Echinocorys gravesi, Micraster decipiens, Cremnoceramus crassus crassus, Platyceramus mantelli, Volviceramus involutus, Cladoceramus undulatoplicatus and higher Offaster pilula. Their occurrences belong to different horizons.
The direct Deposits bryozoan article illustrates Pyriporella seafordensis from Hope Gap and Wilbertopora from Seaford. These are specifically documented Seaford/Hope Gap occurrences.
Quaternary loess caps cliffs at Hope Gap; farther west, dissolution pipes contain younger residual/infilled material. These are superficial features outside the Chalk succession. Historical cliff conditions do not establish current access.
Seaford was discussed as a candidate section in historical work on stage boundaries; it is not the current global Santonian or Campanian stratotype.
Castle Hill Flint 1. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 2. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 3. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 4. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated. Well-developed Zoophycos-shaped flints are labelled at this level in Figure 3.102.
Castle Hill Flint 5. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 6. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 7. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 8. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 9. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 10. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
Castle Hill Flint 11. Numbered flint marker in the western Seaford Head Tarrant Chalk succession. Its local individual thickness is not stated.
References
BGS Lexicon. Seaford Chalk Formation.
BGS Lexicon. Tarrant Chalk Member.
Bryozoans in the English Chalk (2019). Deposits: figured Seaford and Hope Gap specimens.
SAFETY
Hope Gap steps are closed because erosion has made them unsafe. Do not use the steps or bypass the barriers. This closure affects the staircase, rather than the whole Seaford coastline. Check Seaford Town Council’s current access advice before travelling.
Tidal cut-off, falling cliff material and slippery weed are serious hazards. Plan around a falling tide, leave ample time to return and remain clear of the cliff base. A helmet does not make an unstable cliff safe.
Mobile reception can be unreliable. Tell someone where you are going and when you expect to return.
EQUIPMENT
Take sturdy footwear with good grip, tide information, a hand lens, a camera, wrapping material and rigid specimen boxes. Keep the load manageable for the rocky shore.
Loose chalk fossils can be fragile. A soft brush and careful packing are more useful than levering specimens from the platform; do not hammer cliffs or in-situ features.
CLEANING AND TREATING
Allow wet specimens to dry slowly at room temperature, then begin with gentle dry brushing. Support thin shells and exposed echinoid tests rather than scrubbing them or trying to force away attached chalk.
Avoid acids, bleach and routine varnish. Hard chalk or flint preparation can damage the fossil as easily as the matrix; stop if the surface is flaking and seek specialist advice. Keep potentially important specimens unprepared.
IDENTIFY YOUR FINDS
Need help identifying a fossil? Share clear photos, where you found it and its size with the community.
FURTHER READING
Bryozoans in the English Chalk
Mortimore, Wood and Gallois (2001), Cuckmere to Seaford, British Upper Cretaceous Stratigraphy
BGS Lexicon: Seaford Chalk Formation
Seaford Town Council: Visiting Seaford Head Nature Reserve
ACCESS RIGHTS
Seaford Head lies within protected coastal geology and a nature reserve. Follow current reserve signs, closures and collecting guidance; do not hammer the cliffs or damage in-situ features. The Hope Gap closure must be respected even where an older geological account describes the steps.
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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