Although many geologists have produced papers about Lundy, the first complete study was undertaken by Dr A T J Dollar who described Lundy's granite mass as: “the denuded core of far more lofty mountains piled up during the Armorican folding ... half liquid magma pushed up into the cavities at the base of the mountainous folds of rock and solidifies. Then, as millions of years go by with their millions of seasons of rain and frost ... denude the masses ... until a time may be reached when the granite core, the solidified magma so much harder than the overlying rocks, is all that remains.”

Geology Map © K HiscockResearch since then has shown that Dollar’s assumption that the Lundy granite was of the same age as that seen on Dartmoor and Bodmin Moor was incorrect, the Lundy granite being much more recent at between 59 and 52 million years old. This means that rather than being formed during the Amorican folding (now the Varascan orongeny) they were formed as part of a period of active vulcanicity and formed part of the British Tertiary Volcanic Province (BTVP), best known in western Scotland and Northern Ireland.

The southeast corner of Lundy is all that now remains of the overlying slates and these now join the granite in a distinct line from the Sugar Loaf to the Rattles. This slate is similar to the Morte slates of North Devon and may be called Upper Devonian. The island plateau forms a marine plane, similar to many in Southern England at the 120m (400ft) contour.

There are also numerous dykes, mostly of dolerite, that have invaded cracks in the older rocks and since formed foci for erosion. The dykes are a feature of the BTVP and are only slightly younger than the granite at 56-45 Ma. As well as the overall NW-SE trend seen throughout the BTVP, some dykes show evidence of a local centre from which they radiate. This, and the presence of a positive anomaly in the earth’s magnetic field to the west of the island suggest that there was a volcano there which probably reached the surface (although any evidence for this will have eroded away). The Lundy granite formed from the original magma chamber (possibly 10km below the surface at that time) and the dykes from later episodes of vulcanism, their different composition the result of fractional crystalisation.

Dollar classified the granite into three types: G1 which is an even-grained white orthoclase variety; G2, a variety with phenocrysts of orthoclase and quartz set in a microgranite groundmass; and G3 and G3a which are microgranites. These distinctions probably relate to the way that the granite cooled rather than being distinct types.

The plateau surface of the granite massif is almost level and bounded on all sides by steeply inclined sidelands at the base of which are vertical cliffs. The erosive activity of the many small streams that drain the surface has been minimal and virtually all the streams have developed along weaknesses in the granite or along dykes, such as those in Gannets' Combe.

Cheeses © Chris DeeThere has long been discussion of the effects of glaciation on the island but the latest research has suggested that the geomorphology of Lundy can be largely interpreted as the product of glacial processes. There is widespread smooting and lineation (running WNW-ESE) of surfaces, which together with grooved whaleback forms, can be interpreted as subglacial ice moulding. There are also channels, now dry, that can also be intepreted as having formed as subglacial meltwater channels. There are large areas of eratic gravels and cobbles in the north part of the island whose composition reflects the geology of Pembrokeshire to the NW of Lundy. Their location again suggests movement by subglacial meltwater. The two main stream systems (Millcombe and Gannets' Combe) appear to have been overdeepened by meltwater following lines of geological weakness.

Scientific dating has shown that the the rocks were exposed as the ice melted between 35,000 to 40,000 years ago, long before the maximum extent of glaciation was reached (the global Last Glacial Maximum, LGM, at around 26,000 to 21,000 years ago). This dating suggests that the extent and timing of glaciation is complex at the southern limits. It does show that the ice did reach this far south during the last glaciation which had been questioned before.

Following the end of the glacial, Lundy would have formed a significant hill in a wide plain where the Bristol channel now lies. As more ice melted, the sea would have risen and flooded to south and north leaving a peninsula that would have become an island at around 7500 BC. The present landscape is dominated by granite tors formed by the weathering of the granite by chemical and physical processes.

Minerals found on Lundy include copper ore which is found at the junction of the granite and slate at the south end of the island just east of Benjamin's Chair. During the mid-19th century three shafts were opened in the hope of finding workable quantities but the find was not worth commercial exploitation. A vein was also found near Long Roost and three adits were made, but the quality of ore was too poor to be worked. During the Second World War an inspector visited Lundy to see if the molybdenum ore, of which there was then a shortage, could be worked, but again the amount was not commercially viable.

Other minerals recorded are:

  • Beryl - in small white-yellow columnar crystals.
  • Feldspar - in white tubular crystals.
  • Fluorite - crystalline and massive.
  • Garnet
  • Mica - in plates and hexagonal crystals.
  • Rock crystal - transparent, frequently dark brown or black.
  • Schorl
  • China clay - formed from disintegrating feldspar, present in small; quantities but too impregnated with iron to be useful.

In the slate are are veins and strings of Gossan containing:

  • Blende - sulphuret of zinc in traces.
  • Towanite - copper pyrites.
  • Magnetite - magnetic iron ore, found in a vein below Benjamin's Chair.
  • Quartz - amorphous and crystalline is found in veins crossing the slate in every direction. This is the most abundant non-metallic mineral.
  • Limestone - a seam appears on the beach and passes southeastwards through Hell's Gates. This weakness of a soluble mineral probably accounts for the separation of Rat Island from the main island.

 Original text by Tony Langham, updated by Chris Webster

Fungi of all shapes and sizes can be found on Lundy, from microscopic rusts on plant leaves, delicate toadstools in a kaleidoscope of colours, puffballs, spindles, and brackets, right up to the statuesque parasols that grace the plateau in summer.

Parasol © Mandy DeeOver 500 species have so far been recorded, with new species being found every year. The main season for fungi is from late summer through to late winter, but there are always a few to be found all year round. They are most abundant a few days after wet weather, and can become very scarce in prolonged dry spells, even in the middle of autumn.

Woodland species are found not only in the woods and copses, but also associated with the ‘forest’ of Creeping Willow that grows around Pondsbury. Dung fungi are well represented due to the large number of grazing animals, but the most interesting habitat on Lundy is the areas of unimproved grassland, particularly the Airfield, and the short-grazed turf areas on the east side of the plateau.

Blackening Waxcap © Mandy DeeThroughout the autumn, this grassland is dotted with the bright colours of the waxcaps, a group of fungi specific to such areas, and in decline across the country due to the fertilisation of grasslands for farming. They come in a wide range of colours including the reds of the Scarlet and Crimson Waxcaps, the yellows of the Golden and Butter Waxcaps, and also white, green, grey and even pink.

At least 23 species of waxcaps have been found on Lundy, which makes it an internationally important site. The SSSI which covers most of the top of the island means that fungi should not be picked, except by permitted individuals for the purposes of identification.

Dusky Puffball © Mandy DeeIt is only in the last 15 years that much effort has been put in to recording fungi on the island, but regular surveys are now carried out each autumn, along with records added by enthusiastic visitors and island staff. Forays are run for visitors whenever an LFS expert is present on the island, and the  book, Lundy Fungi, by LFS members John Hedger and David George, will hopefully help more visitors become interested in this fascinating kingdom, and see more records added to the log book. There are several field guides available in the Tavern for anyone to use, plus more in the LFS library for members' use.

The definitive list of fungi found on Lundy, including species discovered since the publication of the book, can be viewed here. There are also lists of chromists and protists.

Text by Mandy Dee

More articles on Lundy fungi

Lundy Fungi book now available

2022 Fungi records

Looking for fungi on Lundy during Lockdown by Puffin Post

As is often the case with small islands Lundy has few naturally occurring species of land mammal, although the island's history is rich with examples of deliberate and accidental introductions, not all equally successful.

Native species

The only indigenous Lundy mammal is the Pygmy Shrew Sorex minutus. These tiny insectivores can be seen in and around the properties but also survive in the natural landscape. In recent years thay have been reported from most properties in and around the village but are not dependent upon human habitation having been seen at Halfway Wall, the Terraces and as far north as North Light.

Bats are occasionally observed on Lundy and are usually assumed to be one of the native pipistrelle species; Common Pipistrelle Pipistrellus pipistrellus or Soprano Pipistrelle P. pygmaeus. A passive detector study by Geoff Billington during 2014 confirmed the presence of these two pipistrelle species as well as Greater Horseshoe Bats Rhinolophus ferrumequinum, in relatively high numbers in May. More unusual species detected during this study included the recently discovered Alcathoe Bat Myotis alcathoe, Nathusius Pipistrelle Pipistrellus nathusii and Barbastelle Barbastella barbastellus. Two species not considered resident in the UK were detected; Kuhl’s pipistrelle Pipistrellus kuhlii and Savi’s Pipistrelle Pipistrellus savii. Other species detected in low numbers included Noctule Nyctalus noctula, Long-eared Bat Plecotus sp. and Myotis species which were not identified to species but one was considered to be a Whiskered or Brandt’s Bat Myotis mystacinus / brandtii.

Introduced species

Rabbits Oryctolagus cuniculus are believed to have been brought to Britain after the Norman conquest and there are written records that they were being taken from Lundy for meat and fur as early as 1183. In the early twentieth century many thousands were killed on Lundy each year, with nearly 11,000 believed to have been taken in 1929 alone. It was still considerd to be 'abundant' during an LFS mammal survey in 1953.

The flea-borne disease myxomatosis first appeared in the Lundy Rabbit population in 1983 more than 25 years after it became prevalent on the nearby mainland and probably through deliberate introduction. Following the initial population collapse numbers have fluctated widely with major outbreaks in 1992 and 1996. As recently as 2013 there were reported to be at least 1000 Rabbits still on the island, but since then numbers have plummeted, with Viral Hemorrhagic Disease (VHD) suspected.


Soay Lamb © Mandy DeeSoay Sheep Ovus aries of St Kilda are the most primitive domestic sheep in Europe, resembling the original wild species and the domesticated Neolithic sheep which were first brought to Britain in about 5000 BC.

Soays were introduced to Lundy in 1942, with additions in 1944 bringing the flock to one ram and seven ewes. By 1953 there were 70 or 80 and in 1995 an island-wide survey counted 278. The Lundy Soays now constitute the third largest closed flock of this breed existing in a feral state anywhere in the world and the largest away from St Kilda. Their grazing is of value in assisting in the maintenance of the semi-natural grasslands and heathlands in the northern parts of the island. The 2010 terrestrial management plan recommended that the population be maintained at 120-150 breeding ewes plus followers providing around 30 lambs for slaughter each year. Recent assessments that put the size of the flock at over 300 animals.


Sika Deer © Chris DeeSeven Sika Deer Cervus nippon were introduced to Lundy in 1927 and increased in numbers, despite regular culling, to around 90 individuals in 1961. Before the Rhododendron thickets were cleared from the east sidelands, Sika would shelter there during the day and would only be easy to see in the early morning or evening. Nowadays they are more obvious but relatively few counts are reported and members are encouraged to enter these in the LFS logbook, held in the Marisco Tavern. The 2010 terrestrial management plan recommended that a population of 30 mature hinds and 10 mature stags would form a sustainable population, without adversely impacting the the semi-natural vegetation communities, with the proviso that these targets are regularly reviewed. Culling is still carried out to manage the population size and provide produce for the tavern kitchen, although numbers are typically in excess of the target. In 2022 the post-breeding population was estimated to be in excess of 130 individuals.


Goat © Chris DeeGoats Capra hircus have probably existed on Lundy since the time of its earliest human inhabitants, and it is likely that some of these would have escaped.  Further introductions occurred in 1926 and subsequently. Today the population varies between 30 and 50 and all have the typical appearance of wild goats; long-haired with horns. Numbers are controlled to keep the population stable and they are actively discouraged south of Quarter Wall to minimise damage to the Lundy Cabbage and other key plant communities.

Extinct introduced species

The Ship Rat Rattus rattus and Brown Rat Rattus norvegicus are both originally of Asiatic origin. The former is thought to have been present in Britain since at least the twelfth century and maybe since Roman times, but the latter arrived around 1720. It is not clear when either species reached Lundy or by what means. They could have travelled in baggage or supplies, or desserted one of the many ships that have been wrecked along the Lundy coastline. By 1877 Brown Rats were numerous and the Ship Rat was in decline.

With numbers of Manx Shearwater Puffinus puffinus and Puffin Fratercula arctica in strong decline and with rats strongly implicated in the low productivity of these burrow-nesting seabirds on Lundy, the Seabird Recovery Project was initiated in 2002. Its primary aim was to increase the numbers and breeding success of these two species by eradicating rats from the island. This was a difficult and controversial decision particularly in relation to the Ship Rat which many considered to be “Britain’s rarest mammal”. After 17 months of poisoning with baited traps and a further 21 months of monitoring, Lundy was declared rat free in 2006. In repsonse, number of Manx Shearwaters and Puffins have increased and Manx Shearwaters raised on Lundy have been shown to be returning to the island to breed themselves.

Fallow Deer Dama dama and Red Deer Cervus elaphus were introduced to Lundy by Martin Coles Harman. Both established sizeable herds but over-culling is thought to have reduced the numbers below a sustainable level. Fallow Deer were last recorded in 1954 and Red Deer in 1962.

Unsuccessful attempts were also made to introduce Brown Hare Lepus europaeus, Red-necked Wallaby Macropus rufogriseus. Red Squirrel Scurius vulgaris, were introduced on several occasions but were extinct by 1930.

Domestic stock

In 1928 Martin Coles Harman introduced a herd of fifty ponies to the island in an attempt to establish a new breed of pony. This initial herd mainly consisted of New Forest ponies and Welsh Mountain ponies. The Lundy Pony is an officially recognised breed, with a herd of around twenty ponies being kept on the island. They can usually be found in the Pondsbury area between Quarterwall and Halfway Wall.

The working farm on Lundy includes a flock of Domestic Sheep comprising a mixture of Texel and Cheviot breeds and numbering 300 lambing ewes. A herd of Highland Cattle was introduced in 2012 as part of the island’s conservation programme, to assist with the control of rough foliage such as Purple Moor Grass (Molinia sp.) to increase the vegetation diversity. There are currently nine steers. In recent years there has also been a small herd of Gloucester Old Spot Pigs, but there are none on the island at the moment.

Text by Chris Dee, 2018; updated 2023

Lundy Studies Logo

In 2007, the LFS published the proceedings of a conference held the previous year celebrating the 60th anniversary of the founding of the society. The contents are available below.

Contents

Archaeology and History

Marine and Freshwater Ecology

Terrestrial Ecology

Poster Abstracts

Contributor Profiles

Publication Details

Lundy Studies: Proceedings of the 60th anniversary symposium of the Lundy Field Society. Edited by Jennifer J George. 192 pages, numerous illustrations. 2007. ISBN 978-0-9530532-1-6.

 

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Latest news

The LFS held its first online AGM on Saturday 12th September following the postponement of the meeting in March. A total of 94 members joined us for a business meeting where the Officers gave their reports and the elections of Officers and Committee members took place.

Our Annual Report for 2019 has now been published and is currently being distributed to members, with the generous assistance of the Lundy Shore Office staff.

Our rescheduled AGM will take place online on Saturday 12th September from 1.30pm prompt using Zoom. We look forward to seeing you for a short business meeting followed by the Warden's Report, presented by Dean Jones, and the Lundy General Manager's Report, presented by Derek Green.

 

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