Waterloo

Site of Special Scientific Interest · 54.8613, -5.8069

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Antrim County

Climate exposure

This is about exposure to a nationwide pressure this habitat type carries — not a verdict on this site's own management.

Coastal

Coastal habitats are exposed to sea-level rise and storm erosion. Where hard sea defences sit behind them, there's nowhere landward to retreat to — a squeeze that keeps compressing the habitat no matter how well it's managed.

Habitats

Hard cliff and cliff slope

Geology & landscape

Geological Feature: Geological Fault, Igneous Intrusion, Rock Outcrop · Geological Period: Cretaceous, Jurassic, Triassic · Rock Type: Basalt, Limestone, Mudstone, Shale

Landscape processes: Coastal, Volcanic / Igneous

Description

Waterloo Jurassic stratigraphy, Triassic stratigraphy The area is of special scientific interest because of the sequence of Penarth Group, formerly Rhaetic, Upper Triassic, some 201 million years old and Lower Lias Lower Jurassic, 184-200 million years old strata, offering some of the best exposures in Ireland. Earlier Triassic Keuper and later Cretaceous strata are also present. During this period Ireland was positioned in sub-tropical latitudes, some 30°-40° north. Outcrop mainly takes the form of a wave-cut platform and former sea cliffs. The lowest beds southernmost seen are poorly-exposed red Mercia Mudstones of the Port More Formation. A short distance north 'Tea-Green Marls' of the Collin Glen Formation-actually greenish gray mudstones-are seen in the cliffs and on the foreshore. These mudstones are about 12m thick with numerous pseudo-pisoliths and pseudo-oolites, probable signs of low-grade metasomatism connected to the proximity of the Larne Lough Fault, here not far offshore. The Penarth Waterloo Mudstone succession recorded on the foreshore consists of a series of calcareous and non-calcareous mudstones and shales, together with minor sandstones. The Penarth holds an abundant marine bivalve fauna characterised by the presence of Rhaetavicula contorta and Protocardia rhaetica. In the Larne No 1 Borehole, about 2km to the south-west of Waterloo, the Penarth Group is about 20 m thick, but the succession at Waterloo totals only about 14 m. Two small faults seen on the foreshore may have cut out some of the Mudstone succession. At the top of the Waterloo Mudstones, there is an apparently conformable passage to the lowest beds of the Jurassic, the Psiloceras planorbis Zone of the Lower Lias. The lowest beds are shales and a thin limestone with a few fossils, including Protocardia cf. rhaetica and Pteromya tatei, but after about 7m the lithology changes to massive gray mudstones with abundant fossils, including the Zone fossil Psiloceras planorbis. These planorbis beds, totalling some 26m, can be followed as a series of small reefs up to the line of a Tertiary dolerite dyke which crosses the foreshore following the strike of the Lias beds. North-west of the dyke, a poorly exposed sequence of mudstones, rotten basalt and sheared strata suggests another fault zone trending north-east to south-west. Beyond this, the foreshore is heavily covered by loose boulders and only small, scattered exposures are seen. This shows that the strike swings to nearly north-south, while the dip remains about 25° to the west. West of the small low-water embayment, the lithology changes from the grey mudstones of the planorbis Zone, through an unproved thickness of mudstones of the liasicus Zone, to the alternating mudstones and thin limestones of the anqulata Zone. The foreshore, some 27m east of Waterloo Cottages, shows a section with nearly 7m of anqulata Zone beds, consisting principally of limestone, calcareous shale with Schlotheimia sp. in places, together with coprolites fossilised faecal pellets towards the base. Higher beds of more massive mudstones are seen in a small cliff immediately south of the Cottages. The planorbis, liasicus and anqulata Zones are within the Hettangian stratigraphic stage. About 150m north of these exposures, a small outcrop of a shelly crinoidal limestone and gray mudstones is seen among the boulders just east of Pebble Cottage, apparently separated by a fault from an exposure of gray shale and limestone with a northerly dip, about 20m north. Although no diagnostic fossils are presently evident in either outcrop, specimens in collections, apparently from these exposures, include Coroniceras Metaphioceras sp. and Arnioceras cf. bodleyi indicating the presence of the bucklandi and possibly the semicostatum Zones within the Sinemurian stratigraphical stage. https://www.daera-ni.gov.uk/publications/waterloo-assi

Plant communities

H7 — Hard cliff and cliff slope, Lowland dry heath

Calluna vulgaris-Scilla verna heath

Salix repens, Empetrum nigrum subsp.nigrum, Calluna vulgaris, Erica cinerea, Erica tetralix, Erica vagans, Juniperus communis, Ulex europaeus, Carex caryophyllea, Carex flacca, Carex nigra, Carex panicea, Carex pulicaris, Carex serotina, Luzula campestris, Luzula multiflora, Selaginella selaginoides, Hypnum cupressiforme, Frullania tamarisci, Cladonia chlorophaea, Cladonia rangiformis, Daucus carota, Achillea millefolium, Hypochaeris radicata, Leontodon saxatilis, Leucanthemum vulgare, Scorzoneroides autumnalis, Serratula tinctoria, Jasione montana, Succisa pratensis, Cerastium diffusum, Cerastium fontanum, Silene uniflora, Sedum anglicum, Anthyllis vulneraria, Astragalus danicus, Genista pilosa, Lotus corniculatus, Trifolium repens, Centaurium erythraea, Thymus praecox, Scilla verna, Dactylorhiza purpurella, Euphrasia officinalis, Plantago coronopus, Plantago lanceolata, Plantago maritima, Armeria maritima, Polygala serpyllifolia, Polygala vulgaris, Rumex acetosa, Primula vulgaris, Filipendula vulgaris, Potentilla erecta, Galium verum, Viola riviniana, Agrostis capillaris, Agrostis stolonifera, Aira caryophyllea, Aira praecox, Anthoxanthum odoratum, Dactylis glomerata, Danthonia decumbens, Festuca ovina, Festuca rubra, Holcus lanatus, Koeleria macrantha, Molinia caerulea, Nardus stricta, Chara curta

H8 — Hard cliff and cliff slope, Lowland dry heath, Upland dry heath

Calluna vulgaris-Ulex gallii heath

Calluna vulgaris, Erica cinerea, Erica tetralix, Vaccinium myrtillus, Ulex europaeus, Ulex gallii, Carex binervis, Carex caryophyllea, Carex flacca, Carex pilulifera, Campylopus flexuosus, Dicranum scoparium, Hypnum cupressiforme, Pleurozium schreberi, Pseudoscleropodium purum, Rhytidiadelphus squarrosus, Polytrichum juniperinum, Polytrichum piliferum, Cladonia impexa, Cladonia squamosa, Hypochaeris radicata, Jasione montana, Lotus corniculatus, Hypericum pulchrum, Teucrium scorodonia, Thymus praecox, Scilla verna, Linum catharticum, Pedicularis sylvatica, Digitalis purpurea, Plantago lanceolata, Plantago maritima, Polygala serpyllifolia, Rumex acetosella, Potentilla erecta, Poterium sanguisorba, Rubus fruticosus agg., Galium saxatile, Galium verum, Viola lactea, Viola riviniana, Agrostis capillaris, Agrostis curtisii, Agrostis stolonifera, Agrostis vinealis, Aira praecox, Anthoxanthum odoratum, Avenula pubescens, Brachypodium sylvaticum, Dactylis glomerata, Danthonia decumbens, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Holcus lanatus, Molinia caerulea, Nardus stricta, Pteridium aquilinum, Chara curta

MC1 — Hard cliff and cliff slope

Crithmum maritimum-Spergularia rupicola maritime rock-crevice community

Tortella flavovirens, Crithmum maritimum, Daucus carota, Inula crithmoides, Tripleurospermum maritimum, Cochlearia danica, Cochlearia officinalis, Cerastium diffusum, Silene uniflora, Spergularia rupicola, Atriplex hastata, Plantago coronopus, Plantago maritima, Armeria maritima, Limonium binervosum, Catapodium marinum, Festuca rubra, Parapholis incurva, Asplenium marinum

MC2 — Hard cliff and cliff slope

Armeria maritima-Ligusticum scoticum maritime rock-crevice community

Schistidium maritimum, Ligusticum scoticum, Scorzoneroides autumnalis, Tripleurospermum maritimum, Cochlearia officinalis, Cerastium fontanum, Silene uniflora, Spergularia rupicola, Atriplex hastata, Sedum rosea, Plantago coronopus, Plantago maritima, Armeria maritima, Rumex crispus, Agrostis stolonifera, Festuca rubra, Asplenium marinum

MC3 — Hard cliff and cliff slope

Rhodiola rosea-Armeria maritima 36-ledge community

Angelica sylvestris, Ligusticum scoticum, Scorzoneroides autumnalis, Tripleurospermum maritimum, Silene dioica, Silene uniflora, Sedum rosea, Lotus corniculatus, Plantago lanceolata, Plantago maritima, Armeria maritima, Rumex acetosa, Agrostis stolonifera, Festuca rubra, Holcus lanatus

MC4 — Hard cliff and cliff slope

Brassica oleracea 36-ledge community

Daucus carota, Centaurea nigra, Centaurea scabiosa, Cirsium arvense, Echium vulgare, Jacobaea vulgaris, Leucanthemum vulgare, Pilosella officinarum, Senecio vulgaris, Sonchus oleraceus, Taraxacum officianalis, Tragopogon pratensis, Brassica nigra, Brassica oleracea, Cheiranthus cheiri, Silene nutans, Silene uniflora, Sedum acre, Anthyllis vulneraria, Ononis repens, Teucrium scorodonia, Plantago coronopus, Plantago lanceolata, Armeria maritima, Rumex acetosa, Potentilla reptans, Galium aparine, Agrostis stolonifera, Brachypodium pinnatum, Bromus hordeaceous, Dactylis glomerata, Festuca rubra, Schedonorus arundinaceus

MC5 — Hard cliff and cliff slope

Armeria maritima-Cerastium diffusum ssp. diffusum maritime therophyte community

Carex flacca, Hypnum cupressiforme, Tortella flavovirens, Cladonia chlorophaea, Cladonia foliacea, Cladonia rangiformis, Collema spp., Daucus carota, Achillea millefolium, Bellis perennis, Cirsium acaule, Echium vulgare, Jacobaea vulgaris, Leontodon saxatilis, Pilosella officinarum, Senecio vulgaris, Sonchus oleraceus, Taraxacum officianalis, Tripleurospermum maritimum, Myosotis ramosissima, Brassica oleracea, Cochlearia danica, Cochlearia officinalis, Diplotaxis muralis, Jasione montana, Arenaria serpyllifolia, Cerastium diffusum, Cerastium fontanum, Herniaria ciliolata, Sagina apetala, Sagina maritima, Silene uniflora, Spergularia rupicola, Atriplex littoralis, Sedum acre, Sedum anglicum, Euphorbia portlandica, Anthyllis vulneraria, Hippocrepis comosa, Lotus corniculatus, Trifolium arvense, Trifolium occidentale, Trifolium repens, Trifolium scabrum, Vicia sativa, Centaurium erythraea, Eriodium cicutarium, Salvia verbenaca, Thymus praecox, Scilla autumnalis, Scilla verna, Radiola linoides, Plantago coronopus, Plantago lanceolata, Plantago maritima, Veronica arvensis, Armeria maritima, Ranunculus acris, Reseda lutea, Filipendula vulgaris, Poterium sanguisorba, Galium verum, Agrostis capillaris, Agrostis stolonifera, Aira caryophyllea, Aira praecox, Brachypodium pinnatum, Bromus hordeaceous, Catapodium marinum, Catapodium rigidum, Dactylis glomerata, Festuca ovina, Festuca rubra, Holcus lanatus, Koeleria macrantha, Lolium perenne, Schedonorus arundinaceus

MC6 — Coastal vegetated shingle, Hard cliff and cliff slope

Atriplex prostrata-Beta vulgaris ssp. maritima sea-bird cliff community

Daucus carota, Sonchus oleraceus, Taraxacum officianalis, Tripleurospermum maritimum, Cochlearia officinalis, Silene uniflora, Spergularia rupicola, Atriplex hastata, Malva arborea, Plantago coronopus, Armeria maritima, Polygonum aviculare, Rumex crispus, Bromus hordeaceous, Catapodium marinum, Dactylis glomerata, Festuca rubra

MC7 — Hard cliff and cliff slope

Stellaria media-Rumex acetosa sea-bird cliff community

Juncus articulatus, Scorzoneroides autumnalis, Senecio vulgaris, Tripleurospermum maritimum, Cochlearia officinalis, Cerastium fontanum, Cerastium glomeratum, Silene uniflora, Spergula arvensis, Stellaria media agg., Atriplex hastata, Sedum anglicum, Trifolium repens, Plantago maritima, Armeria maritima, Polygonum aviculare, Rumex acetosa, Rumex crispus, Potentilla anserina, Agrostis stolonifera, Festuca rubra, Holcus lanatus, Poa annua, Poa pratensis

MC8 — Hard cliff and cliff slope

Festuca rubra-Armeria maritima maritime grassland

Carex caryophyllea, Carex distans, Kindbergia praelonga, Tortella flavovirens, Trichostomum brachydontium, Angelica sylvestris, Crithmum maritimum, Daucus carota, Ligusticum scoticum, Achillea millefolium, Cirsium arvense, Hypochaeris radicata, Inula crithmoides, Leontodon saxatilis, Scorzoneroides autumnalis, Sonchus oleraceus, Tripleurospermum maritimum, Brassica oleracea, Cochlearia danica, Cochlearia officinalis, Cerastium diffusum, Cerastium fontanum, Sagina apetala, Sagina maritima, Silene uniflora, Spergularia rupicola, Sedum anglicum, Anthyllis vulneraria, Lotus corniculatus, Trifolium repens, Centaurium erythraea, Scilla verna, Plantago coronopus, Plantago lanceolata, Plantago maritima, Armeria maritima, Rumex acetosa, Potentilla erecta, Agrostis stolonifera, Brachypodium pinnatum, Catapodium marinum, Dactylis glomerata, Festuca rubra, Holcus lanatus, Poa subcaerulea

MC9 — Hard cliff and cliff slope

Festuca rubra-Holcus lanatus maritime grassland

Empetrum nigrum subsp.nigrum, Carex caryophyllea, Carex flacca, Carex nigra, Carex panicea, Luzula campestris, Hypnum cupressiforme, Kindbergia praelonga, Pseudoscleropodium purum, Rhytidiadelphus squarrosus, Trichostomum brachydontium, Cladonia chlorophaea, Peltigera canina, Angelica sylvestris, Conopodium majus, Daucus carota, Heracleum sphondylium, Achillea millefolium, Bellis perennis, Centaurea nigra, Hypochaeris radicata, Jacobaea vulgaris, Leontodon saxatilis, Leucanthemum vulgare, Pilosella officinarum, Scorzoneroides autumnalis, Serratula tinctoria, Solidago virgaurea, Cochlearia officinalis, Campanula rotundifolia, Cerastium diffusum, Cerastium fontanum, Sagina apetala, Silene uniflora, Sedum anglicum, Euphorbia portlandica, Anthyllis vulneraria, Genista tinctoria, Lotus corniculatus, Trifolium repens, Geranium sanguineum, Thymus praecox, Scilla verna, Euphrasia officinalis, Plantago lanceolata, Plantago maritima, Armeria maritima, Rumex acetosa, Rumex crispus, Ficaria verna, Ranunculus acris, Potentilla erecta, Galium verum, Viola riviniana, Agrostis capillaris, Agrostis stolonifera, Aira praecox, Anthoxanthum odoratum, Brachypodium sylvaticum, Dactylis glomerata, Danthonia decumbens, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Holcus lanatus, Koeleria macrantha, Poa pratensis

MG1 — Brownfield, Hard cliff and cliff slope

Arrhenatherum elatius grassland

Hedera helix, Luzula campestris, Brachythecium rutabulum, Kindbergia praelonga, Pseudoscleropodium purum, Rhytidiadelphus squarrosus, Aegopodium podagraria, Anthriscus sylvestris, Conopodium majus, Daucus carota, Heracleum sphondylium, Pimpinella major, Pimpinella saxifraga, Achillea millefolium, Artemisia vulgaris, Carduus nutans, Centaurea nigra, Centaurea scabiosa, Cirsium arvense, Cirsium vulgare, Hypochaeris radicata, Jacobaea vulgaris, Leontodon hispidus, Leucanthemum vulgare, Sonchus asper, Taraxacum officianalis, Capsella bursa-pastoris, Campanula rotundifolia, Knautia arvensis, Scabiosa columbaria, Cerastium fontanum, Silene nutans, Stellaria graminea, Convolvulus arvensis, Lathyrus pratensis, Lotus corniculatus, Lotus pedunculatus, Trifolium pratense, Trifolium repens, Vicia cracca, Vicia sativa, Vicia sepium, Geranium dissectum, Hypericum perforatum, Clinopodium vulgare, Glechoma hederacea, Lamium album, Origanum vulgare, Teucrium scorodonia, Thymus praecox, Linum catharticum, Chamerion angustifolium, Epilobium hirsutum, Epipactis purpurata, Rhinanthus minor, Papaver dubium, Plantago lanceolata, Veronica chamaedrys, Rumex acetosa, Rumex crispus, Rumex obtusifolius, Primula veris, Primula vulgaris, Ficaria verna, Ranunculus acris, Ranunculus bulbosus, Ranunculus repens, Agrimonia eupatoria, Filipendula ulmaria, Potentilla reptans, Poterium sanguisorba, Rubus fruticosus agg., Galium aparine, Galium mollugo sens.lat., Galium verum, Urtica dioica, Agrostis capillaris, Agrostis stolonifera, Alopecurus pratensis, Anisantha sterilis, Anthoxanthum odoratum, Arrhenatherum elatius, Avenula pubescens, Brachypodium sylvaticum, Briza media, Bromopsis erecta, Bromus hordeaceous, Cynosurus cristatus, Dactylis glomerata, Elytrigia repens, Festuca ovina, Festuca rubra, Holcus lanatus, Holcus mollis, Lolium perenne, Phleum pratense, Poa pratensis, Poa trivialis, Schedonorus pratensis, Trisetum flavescens, Pteridium aquilinum, Chara vulgaris

MG10 — Coastal floodplain grazing marsh, Hard cliff and cliff slope, Upland rush pasture

Holcus lanatus-Juncus effusus rush-pasture

Carex hirta, Carex panicea, Juncus articulatus, Juncus effusus, Juncus inflexus, Calliergonell cuspidatum, Kindbergia praelonga, Angelica sylvestris, Oenanthe crocata, Caltha palustris, Cirsium arvense, Cirsium palustre, Pulicaria dysenterica, Senecio aquaticus, Taraxacum officianalis, Myosotis scorpioides, Cardamine pratensis, Cerastium fontanum, Silene flos-cuculi, Stellaria alsine, Equisetum arvense, Equisetum palustre, Lotus pedunculatus, Trifolium pratense, Trifolium repens, Vicia cracca, Iris pseudacorus, Mentha aquatica, Plantago lanceolata, Plantago major, Polygonum hydropiper, Rumex acetosa, Rumex conglomeratus, Rumex crispus, Rumex obtusifolius, Primula vulgaris, Ranunculus acris, Ranunculus repens, Filipendula ulmaria, Potentilla anserina, Urtica dioica, Agrostis capillaris, Agrostis stolonifera, Alopecurus geniculatus, Alopecurus pratensis, Anthoxanthum odoratum, Cynosurus cristatus, Dactylis glomerata, Festuca rubra, Festulolium loliaceum, Glyceria fluitans, Holcus lanatus, Lolium perenne, Phalaris arundinacea, Phleum pratense, Poa pratensis, Poa trivialis, Schedonorus pratensis

MG11 — Brownfield, Coastal floodplain grazing marsh, Hard cliff and cliff slope

Festuca rubra-Agrostis stolonifera-Potentilla anserina grassland

Atriplex portulacoides, Carex arenaria, Carex distans, Juncus articulatus, Juncus bufonius, Juncus gerardii, Brachythecium rutabulum, Odontites verna, Oenanthe lachenalii, Bellis perennis, Cirsium arvense, Cirsium vulgare, Hypochaeris radicata, Matricaria discoidea, Scorzoneroides autumnalis, Senecio aquaticus, Sonchus asper, Taraxacum officianalis, Tripleurospermum maritimum, Cochlearia anglica, Cochlearia officinalis, Cerastium fontanum, Honckenya peploides, Sagina procumbens, Silene dioica, Silene uniflora, Stellaria media agg., Atriplex hastata, Lotus corniculatus, Trifolium repens, Triglochin maritimum, Plantago lanceolata, Plantago major, Plantago maritima, Polygonum aviculare, Rumex acetosa, Rumex crispus, Rumex obtusifolius, Glaux maritima, Ranunculus acris, Ranunculus repens, Potentilla anserina, Potentilla reptans, Galium aparine, Urtica dioica, Agrostis capillaris, Agrostis stolonifera, Alopecurus geniculatus, Ammophila arenaria, Arrhenatherum elatius, Bromus hordeaceous, Dactylis glomerata, Elytrigia juncea, Elytrigia repens, Festuca rubra, Holcus lanatus, Lolium perenne, Parapholis strigosa, Phleum pratense, Poa annua, Poa pratensis, Poa trivialis, Schedonorus arundinaceus, Schedonorus pratensis

MG12 — Coastal floodplain grazing marsh, Hard cliff and cliff slope

Festuca arundinacea grassland

Atriplex portulacoides, Carex distans, Carex nigra, Carex otrubae, Eleocharis uniglumis, Juncus acutiflorus, Juncus articulatus, Juncus gerardii, Juncus inflexus, Juncus maritimus, Kindbergia praelonga, Odontites verna, Oenanthe crocata, Oenanthe lachenalii, Torilis japonica, Cirsium arvense, Hypochaeris radicata, Scorzoneroides autumnalis, Sonchus arvensis, Taraxacum officianalis, Tripleurospermum maritimum, Cerastium fontanum, Stellaria media agg., Atriplex hastata, Equisetum palustre, Lathyrus pratensis, Lotus corniculatus, Trifolium pratense, Trifolium repens, Vicia cracca, Iris pseudacorus, Triglochin maritimum, Triglochin palustre, Plantago lanceolata, Plantago major, Plantago maritima, Rumex crispus, Glaux maritima, Ranunculus acris, Potentilla anserina, Galium palustre, Agrostis capillaris, Agrostis stolonifera, Anthoxanthum odoratum, Arrhenatherum elatius, Cynosurus cristatus, Dactylis glomerata, Elytrigia atherica, Elytrigia repens, Festuca rubra, Holcus lanatus, Lolium perenne, Phragmites australis, Poa pratensis, Schedonorus arundinaceus, Schedonorus pratensis