The shore west of Anstruther harbour exposes Carboniferous plant fossils, shell-bearing rocks and the tilted beds of the Anstruther Formation. Between Anstruther Wester, West Haven and Billow Ness, roots, stems and thin coals record an ancient lowland landscape interrupted by occasional marine incursions. This protected shore is best explored by looking closely and photographing finds; check the permissions below before removing anything.
FIND FREQUENCY: ♦♦♦ – Plant impressions, root structures and shell-bearing cobbles are the main things to look for; their visibility depends on sand, seaweed and weathering. Finding a specimen does not establish permission to take it.
CHILDREN: ♦♦♦♦ – The sandy bay is close to town, but children need supervision around pools, uneven rock ledges and the rising tide.
ACCESS: ♦♦♦♦ – Shore access is close to the seafront and golf clubhouse. Rocky sections require more care than the coastal path and much of the foreshore is covered at high tide.
TYPE: Sandstone ledges, mudstone and siltstone beds, thin coals, dolomitic beds and loose beach cobbles on an early Carboniferous foreshore.
DIRECTIONS
♦ Approach the west side of Anstruther harbour by Crichton Street and Shore Road. Check current signs, charges and restrictions before parking, and leave access clear.
♦ The original guide records shore access at the end of Crichton Street and beside Anstruther Golf Club. The sandy bay at West Haven/Billow Ness lies west of the harbour and beside the golf course; follow the coastal path when the rocky shore is unsuitable.
♦ This guide covers Anstruther Wester through West Haven to Billow Ness. It does not extend the fossil route into the separate Pittenweem and Cuniger Rock sections.
♦ Original guide reference: 56.21856°N, 2.70612°W. This is a general locality reference, not a parking bay or a boundary marker. The current Billowness beach listing gives grid reference NO 562 030.
FOSSIL HUNTING
Begin with the exposed bedding surfaces near Anstruther Wester and the rockier shore west of the sandy bay. The old guide’s photographs show plant-bearing ledges, thin coal layers, shell-rich cobbles and split calcareous blocks. Look at surfaces already exposed by weathering rather than using the photographs of opened blocks as an instruction to break more. A camera, a scale and a hand lens are useful for recording the fossils without disturbing the rock.
Plant remains are the most conspicuous subject in the original collection photographs. Sandstone surfaces may carry elongated stem or trunk impressions and rooting structures. Stigmaria is the name used for the rooting organs of extinct tree-sized lycopsids; repeated rounded rootlet scars can be a useful recognition feature. Weathering may leave only part of the pattern, and a worn elongated mark is not enough for a species identification. The original guide identified some examples as Stigmaria ficoides, but the photographs have not been revised at species level here.
Some of the old photographs show dark plant fragments on fresh surfaces inside pale-weathering, calcareous cobbles and blocks. Other specimens contain only indistinct fragments. These detached rocks illustrate a preservation style, but they cannot be assigned securely to a named marine band from their appearance alone. Examine existing broken faces and naturally weathered surfaces, taking an overall photograph as well as a close-up. Record whether a fossil is attached to a bed or lies loose: that difference is important when someone later tries to identify it or interpret its origin.
Thin coal seams and carbon-rich layers provide a second way to follow the plant-bearing succession. Not every black film preserves identifiable plant anatomy, and the best evidence may be a root-bearing surface next to the carbonaceous material. Sandstone also contains sedimentary structures unrelated to fossils. Cross-bedding forms sets of inclined layers through the rock, while shrinkage cracks form networks across a surface; neither should be mistaken for bark or branching roots merely because it makes a striking pattern.
Shell-bearing pebbles and cobbles occur in the original photographs. Look for repeated curved shell sections, valve outlines and impressions rather than assuming every pale line is a fossil. The Survey records non-marine bivalves, ostracods and fish fragments in both the Anstruther Wester and Billow Ness sections, including the bivalve Naiadites obesus. A shell-rich rock is therefore not automatically evidence of a fully marine bed. Loose cobbles may have travelled along the beach, so record them as loose finds rather than giving them a guessed bed name.
Marine fossils occur in particular horizons within the predominantly non-marine succession. Published records from the Anstruther Wester Marine Band include Girtyspira sp. and Lithophaga lingualis; the Billow Ness Marine Band includes Lingula mytilloides, Naiadites cf. crassus and Schizodus pentlandicus. These are documented records, not a promise of easily identifiable specimens on every visit. The names given here follow the published Survey records.
On the west side of the Billow Ness bathing pool, siltstones preserve small burrows described by the Survey as ‘small simple pipes’. These are traces of activity in the sediment rather than pieces of the animal itself. Look for small repeated structures on exposed siltstone surfaces and photograph the bedding context. The memoir describes these burrows without assigning them a species name.
Billow Ness has also contributed to research on microscopic ostracods, tiny crustaceans enclosed in paired shells. A study first published online in 2011 and printed in 2012 records Cavellina benniei and Geisina arcuata from mudstone samples in the Anstruther field section. They are microscopic research records, not ordinary unaided beach finds, and the published sample table does not place them in the Billow Ness Marine Band. Do not take bulk samples to search for them without the appropriate permission and consent. For an unusual fossil, record its position, photograph it and seek expert advice before disturbing it.
A chronological record of the measured sections, geological revisions and fossil research at Anstruther Wester and Billow Ness.
1902 – Early measured section published
James W. Kirkby’s account of the Anstruther–Pathhead beds formed part of the geological memoir published that year. Its Anstruther observations included a possible marine band above the Anstruther Wester horizon. Later work retained that record but found the recovered fossils too poorly preserved to confirm the interpretation.
1964 – Anstruther Borehole drilled
A borehole sunk from the old pier at Anstruther Wester penetrated 300 metres of strata. Its overlap with the lowest part of the shore section gave geologists a subsurface reference for relating the exposed beds to the deeper Carboniferous succession.
1977 – Shore succession revised and marine bands named
I. H. Forsyth and J. I. Chisholm’s resurvey memoir distinguished the Anstruther Wester and Billow Ness sections, named their marine bands and documented the intervening concealed interval at West Haven. The Billow Ness description recorded approximately 145 metres of strata, including rooted beds, dolomites, sandstones and fossil-bearing horizons.
1986 – Anstruther unit given formation rank
M. A. E. Browne elevated the former Anstruther Beds to formation status. The Anstruther Formation remains the formal name for these rocks, with Anstruther Wester and Billow Ness among its partial type sections.
2000–2001 – Firth of Forth SSSI designation
The present Firth of Forth SSSI was notified on 15 August 2000 and confirmed on 10 May 2001. It includes the designated west-shore strip at West Haven and Billow Ness, recognising the coast as part of a wider protected natural resource.
2011–2012 – Microscopic ostracods documented
C. E. Bennett and colleagues published records of Cavellina benniei and Geisina arcuata from Billow Ness mudstone samples in their study of early Carboniferous freshwater and brackish-water ostracods. The paper appeared online in September 2011 and in print in 2012. These microscopic field-section records are distinct from the larger plant and shell fossils visible in the shore photographs.
GEOLOGY
The rocks between Anstruther Wester and Billow Ness belong to the Anstruther Formation of the Strathclyde Group. The current BGS Lexicon assigns the formation to the Asbian, within the late Viséan of the early Carboniferous. Older accounts call the same unit the Anstruther Beds. That historical name is not an additional member, and the local shore is not a complete exposure of the formation’s much greater regional thickness.
The succession alternates between mudstone, siltstone and sandstone, with bedded dolomite, rooted beds and thin coal seams. These rocks record a predominantly non-marine lowland landscape in which sediment accumulated in water bodies and on surfaces that could become vegetated. Root-bearing beds and coal preserve evidence of plants growing on or contributing to those surfaces. Changes in the sediment supply and conditions of deposition produced repeated, although not always complete, sedimentary cycles. The resistant sandstones now stand out as ridges and ledges, while sand and shingle conceal parts of the softer succession.
Occasional marine incursions interrupted that history. The Anstruther Wester and Billow Ness marine bands have more restricted faunas than a typical open-marine Carboniferous limestone, while much of the surrounding sequence contains non-marine bivalves, ostracods and fish debris. This is why fossil shells alone do not distinguish a marine band from another fossiliferous layer. The position of a specimen in an observed bed matters as much as its appearance, and that information is lost when a detached cobble is assigned to a horizon by guesswork.
Folding and faulting also shape the walk. The Anstruther Wester section begins near the Anstruther Anticline, and the Billow Ness beds dip south-west at angles reaching about 25 degrees. West Haven separates the two sections with a sandy gap: the Survey inferred about 30 metres of concealed strata from the comparable bedding attitudes on either side and the absence of recognised faulting there. Farther west, a small north-westerly fault marks the end of the Billow Ness section. Neither the distance walked nor the height of a rock ledge is a direct measure of the stratigraphic thickness.
The 1964 Anstruther Borehole is an important subsurface reference because it began near the base of the Wester shore section and continued down through 300 metres of strata. It is not a 300-metre cliff section or a source for assigning every borehole fossil to the beach. Similarly, the roughly 145 metres measured at Billow Ness describe that named section, including its repeated beds, rather than the entire formation. The detailed account below separates measured thicknesses, inferred concealed intervals and the relative positions of individual horizons.
A closer look at the Anstruther Wester and Billow Ness beds, their fossils and the gaps between the exposures.
STRATHCLYDE GROUP
The local succession belongs to the Strathclyde Group, a major part of the early Carboniferous record of the Midland Valley of Scotland. On this shore it is represented by predominantly non-marine sedimentary rocks with intermittent marine horizons. This account is restricted to Anstruther Wester, West Haven and Billow Ness; it does not incorporate the younger neighbouring Pittenweem sections.
Anstruther Formation
The current formation is assigned to the Asbian Substage of the late Viséan. Its older name, Anstruther Beds, occurs in the 1977 Survey memoir and describes the same stratigraphic unit rather than a separate member. No formal member subdivision is established for the exposures described here. The characteristic association is mudstone, siltstone and sandstone in repeated cycles, with thin carbonate beds and coal. The formation’s regional maximum thickness exceeds 810 metres, but that value must not be applied to this walk. Its lower boundary is not known at outcrop; its defined upper boundary at the base of the Cuniger Rock Marine Band is outside the demonstrated core route.
Anstruther Wester: cyclic beds and the borehole overlap
The shore section extends south-west from the Anstruther Anticline, whose axis the 1977 memoir places at NO 567 033, to the sand at West Haven, NO 5635 0300. Mudstones, siltstones and sandstones are accompanied by bedded dolomite and root-bearing beds. The cyclic arrangement is imperfectly developed and coal seams are few and thin. Most beds belong to the memoir’s grey facies, with one thick sandstone distinguished from that general pattern. The lowest 26 metres overlap the top of the Anstruther Borehole succession and were described as poorly exposed. That overlap is a stratigraphic relationship, not a claim that 26 metres of clean rock can be inspected continuously today.
Anstruther Wester Marine Band
This named horizon occurs at NO 5653 0330 within the Anstruther Formation. Its restricted molluscan fauna includes the published records Girtyspira sp. and Lithophaga lingualis. The band provides evidence of a marine incursion within a succession otherwise dominated by non-marine conditions. The published account does not give a thickness for this marine band at Anstruther Wester.
Historically reported band six metres higher
Kirkby’s section, published in 1902, described another marine band at bed 718, six metres above the Anstruther Wester Marine Band. The later Survey found the recovered fossils too poorly preserved to identify: they might be marine, but that interpretation was not confirmed. The six metres is the separation between horizons, not the thickness of this bed. Its fauna and correlation therefore remain uncertain.
West Haven: concealed interval
Sand interrupts the exposure between the top of the Anstruther Wester section and the base of the Billow Ness section. Similar bedding attitudes on the two sides, with no recognised evidence of faulting at the gap, led the Survey to infer about 30 metres of concealed strata. This is an estimated missing interval, not 30 metres of exposed sandstone, a measured bed or a demonstrated unconformity. The modern beach sand conceals the Carboniferous rocks and is not part of the formation.
Billow Ness: measured section and sandstone ledges
From the west side of West Haven the Billow Ness section continues to a small north-westerly fault at NO 5590 0269. About 145 metres of strata were measured, dipping south-west at up to 25 degrees. Mudstone, siltstone and sandstone recur with bedded dolomite; seatbeds, the rooted substrates beneath former vegetated surfaces, are especially well developed in the lower part. Non-marine bivalves, ostracods and fish debris dominate the documented fauna. Two thick sandstones occur, one forming Johnny Dow’s Pulpit at NO 5618 0280. The published section description does not give separate thicknesses for these two sandstones. The western fault separates Billow Ness from the Chain Road section; any succession beyond it is outside this guide’s core account.
Billow Ness Marine Band
The named marine band at NO 5606 0272 contains marine bivalves and Lingula. The Survey’s locality records include Lingula mytilloides, Naiadites cf. crassus and Schizodus pentlandicus. It is a fossil-bearing horizon within the Anstruther Formation, not a formation or member in its own right. The published section description does not give a separate thickness for this marine band.
Higher Lingula horizon
Lingula was also recorded between a coal seam and a bedded dolomite two sedimentary cycles above the Billow Ness Marine Band. This is a separate fossil horizon with a stated position in the succession. The account gives no measured separation in metres for this higher horizon.
Trace-fossil siltstones beside the bathing pool
At NO 5610 0277, on the western side of the Billow Ness bathing pool, siltstones contain well-preserved small burrows described as ‘small simple pipes’. These burrows are identified descriptively in the memoir. Their precise level relative to the named marine horizons is not established, so they are not plotted in the chart.
Fossils recorded across the two sections
The 1977 locality index records Naiadites obesus, ostracods and fish fragments in both the Anstruther Wester and Billow Ness sections; Spirorbis sp. is recorded for Wester. These records refer to the sections as a whole, rather than all belonging to either named marine band. Likewise, root and stem impressions in the original guide’s photographs demonstrate plant preservation on this shore, but detached photographed blocks cannot be given a precise stratigraphic position from their appearance.
Microscopic Billow Ness ostracods: sampled horizons not fixed here
The study first available online on 9 September 2011 and published in print in 2012 includes two exact Billow Ness field-section records in its Table 2. Mudstone sample EK 9601 yielded three specimens of Cavellina benniei, comprising a carapace, a single valve and a juvenile single valve. Sample EK 9591 yielded one single valve of Geisina arcuata. These are microscopic ostracods recovered for research. The table does not allocate the samples to the Billow Ness Marine Band, and records from other boreholes or formations in the same paper are not treated as occurrences on this walk.
Anstruther Borehole: subsurface reference
Drilled from the old pier in 1964, the borehole penetrated 300 metres below a starting level near the base of the Anstruther Wester shore section. It helps place the exposed strata in their wider sequence, but most of that core is below the shore succession. Its deeper fossil horizons and correlations with the Randerston section are not reproduced as additional surface collecting beds here.
References
Forsyth, I. H. & Chisholm, J. I. (1977), The geology of east Fife, chapter 3, pp. 22–23 and Figure 3; chapter 9 and Appendix 1, localities 1 and 6.
British Geological Survey, Lexicon: Anstruther Formation, current definition, age and hierarchy.
British Geological Survey, Anstruther Formation synthesis, historical terminology and type sections.
Bennett, C. E. and colleagues (2012), Ostracods from freshwater and brackish environments of the Carboniferous of the Midland Valley of Scotland: the early colonization of terrestrial water bodies, Geological Magazine 149(3), 366–396, Table 2; first published online 9 September 2011, DOI 10.1017/S0016756811000719.
SAFETY
Plan the rocky-shore part of a visit around a suitable low tide and check the tide times and forecast before setting out. Keep a clear return route to the coastal path and do not round a headland or cross a low channel simply because it was dry on arrival. Much of the foreshore is submerged at high tide, and waves can reach low ledges before the surrounding rock is fully covered.
Dipping beds, pools and seaweed make footing uneven and slippery. Wear grippy footwear, avoid jumping between boulders and supervise children closely away from the sandy beach. Stay on the coastal route beside the golf course, remain aware of golfing activity and obey local signs. Do not climb or undermine rock faces, move heavy blocks or work beneath unstable material.
EQUIPMENT
Take sturdy footwear, weatherproof clothing, tide information, a charged phone or camera, a hand lens and a small scale for photographs. A notebook or location record helps distinguish finds in place from loose cobbles. This observation-focused visit does not require a heavy hammer, chisel or equipment for splitting boulders.
If a specific collecting activity has been authorised, follow its limits and carry suitable wrapping and labels for permitted specimens. Permission to remove one kind of loose material must not be treated as permission to hammer the bedrock or take bulk research samples.
CLEANING AND TREATING
For specimens already lawfully collected, begin with minimal preparation. Photograph the specimen and its label before cleaning, let it dry slowly at room temperature and use a soft dry brush to remove loose sand. Plant impressions and carbonaceous films may be much more delicate than the surrounding rock; avoid scrubbing or repeatedly wetting them.
Calcareous blocks and shell-bearing rocks should not be treated with household acids or bleach. Do not force hard matrix away where the plant impression or shell breaks with it, and do not routinely coat fossils with varnish. Keep uncertain or potentially important specimens unprepared for specialist examination, with their exact locality, collecting date and permission information.
IDENTIFY YOUR FINDS
Need help identifying a fossil? Share clear photos, where you found it and its size with the community.
FURTHER READING
BGS: The geology of east Fife, including Anstruther Wester and Billow Ness
BGS Lexicon: Anstruther Formation
Bennett and colleagues: Carboniferous ostracods, including Billow Ness samples
Fife Coast and Countryside Trust: Anstruther Billowness beach
NatureScot: Firth of Forth SSSI
NatureScot: Scottish Fossil Code
ACCESS RIGHTS
The core west-shore exposures at the Anstruther Wester Marine Band, West Haven and Billow Ness lie within the designated coastal strip of the Firth of Forth SSSI. The boundary is not the whole of Anstruther town or harbour. Geological grid references are approximate location aids and must not be used to infer an exempt collecting patch just outside a mapped line.
The site’s operations requiring consent include removal of geological specimens, including rock samples, minerals and fossils. Before taking anything, obtain permission from the relevant mineral-rights holder and confirm that the necessary consent covers the activity. NatureScot consent is normally arranged through the owner or occupier. Public access does not itself permit fossil removal, including loose specimens, and no general collecting permission has been established for this route.
Follow the Scottish Fossil Code, local signs and any conditions attached to permission or consent. Without the necessary authorisation, leave specimens in place and do not hammer bedrock, split boulders, excavate or take bulk samples. Walk, observe and photograph without disturbing wildlife or damaging exposures; record unusual finds and seek advice. Historic photographs of split specimens do not establish present-day permission.
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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