Forty–three Bronze Age cairns have been recorded, some of which have granite kerbstones and others are linked by hedge walls. A cairn usually indicates a burial site. On the west side of St Warna’s Cove is a stone–lined well that is reputed to be of great antiquity, and close to where the saint is supposed to have come ashore in a coracle after a journey from Ireland. The name Warna is unknown anywhere else as a Celtic saint, and may be the name of a Celtic water goddess. In the past pins were dropped into the well as an offering to encourage storms to drive ships ashore. Wrecks were a vital resource for coastal communities. Ceramic beads from the 17th-century wreck of a Venetian ship can be found on the beach at Beady Pool on Wingletang Bay.
Geology
The underlying rock is Hercynian granite covered by thin, skeletal and podzolic soils on the higher land where there are many weathered outcrops. At the southernmost tip is Horse Point which is almost separated from the rest of St Agnes by a narrow neck of blown sand between two bays; Wingletang Bay and Porth Askin. Along the coast to the west towards St Warna Cove are boulder beaches.
Wildlife and ecology
Wingletang Down is of maritime heath, dune grassland and scrub reaching a maximum height of above sea level and is considered by Plantlife to be an Important Plant Area. Due to exposure to salt–laden winds, wind-pruned or "waved" maritime heath has developed on the low nutrient, shallow soils on the higher land, whilst to the south on the deeper sandy soils close to sea–level dune grassland grows. At the southern promontory of Horse Point there is short maritime grass and a tumble of large granite boulders where shallow temporary brackish pools occur. Sea milkwort is a rare plant in Scilly and grows here. Sand sedge and sand couch dominate the dune grassland between Wingletang Bay and Porth Askin whilst flowering plants include common storksbill, Portland spurge and hemlock water dropwort which is unusual here as it usually grows in wet habitats. At Beady Pool, which is part of Wingletang Bay, sea kale grows on the strandline along with yellow horned poppy and sea spurge. There is a colony of Six–spot Burnet here and in the past Ringed Plover nested. The nationally scarceearly meadow grass grows in the short maritime grass west of Porth Askin. The wind pruned maritime heath, on the higher part of the site is dominated by western gorse, heather and bell heather. This heath is unique because all three Ophioglossum species found in the British Isles have been recorded within this small area. The largest and easiest to find is adder’s–tongue which is the commonest on the mainland but the rarest in Scilly and has not been seen in the Isles since 1990, or on Wingletang Down since 1938. The second which has been recorded on all the inhabited islands is small adders’s–tongue, which is nationally scarce and found along the western coast of Britain and Ireland north to Orkney and Shetland; there is only one recent Cornish record from near Porthgwarra. The third is least adder’s–tongue which, in Britain, is known only from this small area of St Agnes, where it was discovered in March 1950 by John Raven who found a colony of about one hundred fronds covering an area of one square metre. Botanists have since found other colonies all within the area of the downs. The probable reason for its late discovery is because the fronds are found in the winter and turn yellow and disintegrate by early April which is before most botanists are in the area. Since the withdrawal of grazing by cattle and, due to Myxomatosis, the fall in the population of rabbits, some of the colonies are in danger of being smothered by competitive vegetation such as bracken, European gorse and bramble. Outside of the Isles of Scilly the nearest colony is in Guernsey where it was discovered in 1854.
