Rusey Cliff is a remote locality where Carboniferous shales and sandstones have been intensely folded, faulted and veined. Its principal interest is the Rusey Fault Zone; fossil reports from the original guide need careful interpretation among the striking quartz breccias and mineral textures.
FIND FREQUENCY: ♦♦♦ – Historical reports include plants and shelly material, but exact occurrence and present productivity remain uncertain.
CHILDREN: ♦ – Remote, steep and unstable ground makes this unsuitable for young children.
ACCESS: ♦♦ – A strenuous coast-path approach; the old beach scramble must not be assumed safe or available.
TYPE: Remote cliff and foreshore locality, best approached as a geological observation site.
DIRECTIONS
♦ From Boscastle follow the B3263 towards the A39 and the crossroads by the Marshgate turning, then take the coastal road towards Newton Farm. The original locality approach links with the public bridleway and coast path.
♦ The original locality reference is 50.715545°N, 4.651741°W. This is an orientation point, not a confirmed parking space or safe descent. Parking is very limited; obey current signs and keep farm entrances, gates and passing places clear.
♦ Use the signed public path. The older guide describes a route across landslipped ground to the beach, but that descent cannot be relied on today. If the way down is unclear, eroded or unstable, remain on the coast path rather than attempting an improvised scramble.
♦ A beach visit requires a separately checked safe approach, calm conditions and a conservative low-tide plan. The open coast path alone does not establish safe access to the foreshore.
FOSSIL HUNTING
The original guide records plant-like remains in shale near its approach and corals, brachiopods and goniatites in calcareous material on the foreshore. These are historical field observations, not an independently confirmed species list or evidence that the same material is currently exposed. The exact-site structural studies are much stronger on the rocks and faults than on fossil abundance. Rusey should therefore be approached with modest expectations and particular care over provenance.
Where a safe, permitted loose shale surface can be examined, look for a coherent organic film or repeated leaf, stem or shell structure. Dark staining and cleavage seams alone are inconclusive. A possible goniatite should show a recognisable coil, chamber divisions or consistent shell ornament; simply finding a round outline does not establish a fossil. Brachiopod-like material may retain radial ribs and a shell-shaped margin, while convincing coral sections require internal biological structure.
The most distinctive lookalikes here are associated with the fault zone. Pale quartz can form a network around dark rock fragments, producing rings and branching shapes that resemble shells or plants. Microscopic feathery and filament-like quartz textures studied at Rusey are mineral-growth features. They are not fossil feathers or an additional plant assemblage.
Photograph the whole specimen, close detail and surrounding rock with a scale. Note whether the material is shale, sandstone, calcareous rock or quartz-rich breccia, and whether it is loose or in place. Do not identify a fossil’s age merely from the nearest mapped formation: major faults and displaced blocks interrupt the rocks here. Leave unusual in-place material untouched, and seek specialist advice before removal or preparation.
A chronological record of fossil discoveries, geological research and site history at Rusey Cliff.
1972 – Rusey fault relationships mapped
The geological survey memoir of the Tintagel–Bude coast documented the structural setting later examined in detailed headland studies. This is a publication milestone rather than a first fossil-find date.
1990 – Protected coastal designation revised
Boscastle to Widemouth was re-notified on 21 September, recognising a coast whose geological interest includes its major structural exposures.
1996 – Headland structure and fluid effects investigated
Elizabeth Thompson and John Cosgrove described the faulted headland packages and breccia. Complementary work by Andrews, Day and Marshall examined the local thermal anomaly associated with the fault zone.
2003 – Structural and hydrothermal history developed
Elizabeth Thompson’s doctoral work examined how fault movement, fluids and brecciation interacted at Rusey.
2016 – Quartz growth textures analysed
Tim Yilmaz, Florian Duschl and Danilo Di Genova published detailed study of the feathery and network-like textures in Rusey quartz, interpreting their mineral origin.
GEOLOGY
Rusey exposes a tectonically disturbed belt between contrasting Carboniferous rock packages. To the north, thick sandstone–shale alternations belong to the Crackington Formation. Mud-rich rocks to the south are associated with the Boscastle succession. Between them, the headland and Middle Strand contain strongly deformed shales, thin sandstone beds and quartz-matrix breccia. This is a spatial fault-zone inventory, not a normal layer-cake succession through all the regional formations.
The original marine sediments were compressed, folded and thrust during the Variscan deformation. Later movement included extension and sideways displacement along faults. Hot fluids and repeated fracturing helped form the quartz veining and breccia, making mineral textures conspicuous and sometimes obscuring original sedimentary or fossil features. The width of the disturbed ground is not the thickness of a stratigraphic unit.
A published interpretation treats the different local facies as related parts of a turbiditic depositional system, but exact correlations across the faults remain uncertain. Fossil ages established beside the disturbed zone cannot simply be assigned to every rock inside it. Older expressions such as “Rusey beds” and “Boscastle Beds” are useful historical labels, not evidence for new formal members or a complete measurable section at the beach.
Detailed geology and stratigraphy of Rusey Cliff, including the limits of local correlation.
The described belt is approximately 230 m across. That value combines spatial exposures; it is not a formation thickness. The following units and structures are deliberately not arranged as an unfaulted youngest-to-oldest column.
TEIGN VALLEY GROUP
The formal regional framework includes the Boscastle Formation. This parentage should not be read as a precise assignment of every disputed rock within the Rusey Fault Zone.
Boscastle Formation
The regional unit contains dark pyritous mudstone and siltstone with packets of quartzose sandstone. Calcareous or shelly lenses occur in the wider succession. Its Viséan–Chokierian age range does not establish a fossil assemblage or a precise age for each Rusey exposure.
Buckator Formation: regional context only
The Buckator Formation is part of the neighbouring regional stratigraphic discussion. Its partial type section lies south-west of Buckator, not at Rusey. Neither that section’s approximately 35 m thickness nor its complete succession is imported into this guide.
Local fault-zone packages: uncertain formation assignment. The Middle Strand, headland and breccia-bearing rocks below are described spatially. Their formal formation assignments and precise correlations remain uncertain; they are not presented as subdivisions of the Boscastle Formation.
Middle Strand shales
The approximately 130 m-wide exposure described north-east of the headland comprises relatively uniform mid-grey shale with iron-rich bands around 2–3 cm thick. These figures distinguish exposure width from the thickness of individual bands.
Rusey headland shales and thin sandstones
The approximately 100 m-wide headland exposure contains dark blue-grey to black shale with sandstone beds around 10 cm thick. Cleavage and bedding vary sharply through the deformed ground; a single representative dip cannot describe the whole exposure.
Structurally underlying shale and quartz breccia
Shales beneath the headland package lack sandstone in the examined exposure and contain quartz-matrix-supported breccia up to about 3 m thick. The breccia can be lens- or wedge-shaped rather than persistent. Smaller breccia bands and abundant quartz veins accompany it. It is not a continuous fossiliferous limestone bed.
Rusey Fault and thrust surfaces
The headland is cut by a fault array termed fault zone A in the study. Below it lies the Rusey Fault, a distinct slip surface that converges towards fault zone A. Their interaction produces intense folding and disruption. Fold and bedding relationships indicate thrust movement towards the north-west; this movement predates later extension and sideways displacement.
Cliff Fault and steep bounding faults
The Cliff Fault cuts the breccia-bearing package and lowers its north-eastern side. Slickensides and dragged beds indicate a significant sinistral, or left-lateral, component as well as extension. Similar thrust-folded rocks and characteristic breccia occur on the headland and in the fault’s footwall. The later movement offsets this earlier structural association.
Faults X, Y and Z around the headland
Fault X behind Middle Strand lowers its eastern side and also shows a dextral, or right-lateral, component. Fault Y lies between it and the headland, while fault Z bounds the south-west side. Together Y and Z help isolate the Rusey headland as a downfaulted block. Poor exposure prevents exact slip vectors from being established for these bounding faults. These are mapped structures, not numbered stratigraphic beds.
HOLSWORTHY GROUP
The northern sandstone-rich succession belongs to this formal group. The bar marks its regional formation affiliation, not a proved conformable contact across the fault zone.
Crackington Formation
North of the headland, alternating shale and turbiditic sandstone include individual sandstone beds exceeding 1 m. This contrasts with the thin-sandstone headland facies. The main guide does not import the measured logs or marine bands of Crackington Haven, Wanson or other coastal localities.
Depositional correlation and its limits
Thompson and Cosgrove interpreted the northern sandstone-rich Crackington facies as relatively proximal turbidites, commonly preserving massive or graded sand followed by parallel and locally ripple lamination, the AB(C) divisions of the Bouma scheme. The southern Boscastle facies is finer and more distal, mainly fine laminated sediment and mud with some ripple divisions (D/E with C). The headland package is intermediate but still predominantly fine-grained CDE facies. They proposed related lateral and temporal parts of one depositional system. However, the cited Namurian fossils were not demonstrated to come from inside the most disturbed zone, so neither all Boscastle rocks nor the quartz breccia acquire an exact Namurian age from that interpretation.
Quartz textures and fluid activity
Later research investigated the thermal anomaly, hydrothermal brecciation and quartz recrystallisation. The feathery and network-like textures are interpreted as mineral features associated with a metastable silica precursor. They help explain conspicuous non-biological patterns; they add no ordinary fossil species list.
References
Thompson & Cosgrove (1996), The structural and regional setting of the rocks of the Rusey headland, Proceedings of the Ussher Society 9, 133–135
BGS Lexicon: Teign Valley Group
BGS Lexicon: Boscastle Formation
BGS Lexicon: Buckator Formation
Yilmaz, Duschl & Di Genova (2016), Feathery and network-like filamentous textures as indicators for the re-crystallization of quartz from a metastable silica precursor at the Rusey Fault Zone, Cornwall, UK, Solid Earth 7, 1509–1519
Andrews, Day & Marshall (1996), thermal-anomaly research at the Rusey Fault
BGS Lexicon: Holsworthy Group
BGS Lexicon: Crackington Formation
Thompson (2003), The structural and hydrothermal evolution of the Rusey Fault Zone, north Cornwall
SAFETY
Do not climb through fresh landslides, cross private enclosures or descend an unstable cliff to reach the beach. The route is remote, strenuous and exposed, with steep drops and potentially poor communications. Tell someone your plan and do not rely on mobile reception.
The foreshore combines wet shale, loose blocks, rockfall risk and Atlantic swell. High water can remove the beach and the exit. Even at low tide, waves may make an otherwise exposed route unusable. Stay away from cliff bases and return while your verified exit remains comfortably clear.
EQUIPMENT
For the coast path and observation, carry suitable walking footwear, weather protection, water, a map, tide information and a basic first-aid kit. A camera and hand lens are more useful than extraction tools. Do not hammer the fault exposures or disturb unstable blocks.
CLEANING AND TREATING
If a small specimen may lawfully be taken, keep its matrix, label and any counterpart together. Use gentle dry brushing rather than acid, bleach or vigorous washing. Support weak shale and leave unusual mineralised or potentially significant material unprepared for specialist assessment.
IDENTIFY YOUR FINDS
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FURTHER READING
Thompson & Cosgrove (1996), The structural and regional setting of the rocks of the Rusey headland, Proceedings of the Ussher Society 9, 133–135
Yilmaz, Duschl & Di Genova (2016), Feathery and network-like filamentous textures as indicators for the re-crystallization of quartz from a metastable silica precursor at the Rusey Fault Zone, Cornwall, UK, Solid Earth 7, 1509–1519
BGS Lexicon: Boscastle Formation
BGS Lexicon: Crackington Formation
South West Coast Path: Crackington Haven to Tintagel
ACCESS RIGHTS
Rusey lies within Boscastle to Widemouth SSSI. Keep to established public paths and obey current notices. No general right to remove fossils follows from walking access or from the protected-site designation.
An observation visit is the appropriate default. Do not excavate the landslide, sample bedrock or dislodge boulders. Any taking of loose specimens depends on the current landowner’s rules and applicable restrictions; the old guide is not permission to collect.
Original guide’s designation document (historical copy; check current notices and the official site record above): SSSI Information – Rusey Cliff
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