Cronk Mooar was a medieval burial mound which was excavated fully before it was lost to coastal erosion in the mid-20th century. Cronk Mooar was surveyed and archaeologically removed by Mr (later Professor) I. Bowen at the request of the Air Ministry in 1939. Investigation was curtailed at the outbreak of war but was resumed by Dr G. Bersu in 1945. The 1939 excavation found that the mutilated, sandy mound appeared to have been 10-11 metres in diameter and about 3.0 metres high before its systematic removal down to the probable old turf-line. No trace of structures were found except for the remains of a wooden beam which protruded from an infilled central pit (not investigated until 1945). The mound material revealed some flints, including artefacts, burnt clay, charcoal, fragments of iron slag, burnt bone and evidently a number of nails which were erroneously considered (as proved in 1945) to belong to a ship burial. In 1945 the second excavation investigated the untouched soil beneath the removed mound; the humus above this level contained flints, iron slag, animal bone, possibly daub and some badly eroded prehistoric pottery. The central pit and decayed wooden beam, located by Bowen, was further investigated. The sides of the pit were lined with wooden planks forming a box or coffin which Wilson later interpreted as a probable 'Kammergrab' (Scandanavian timber-lined burial chamber). This feature contained at its base an extended Viking male burial, much decayed, together with a Celtic ring-headed pin, wooden-handled iron knife with leather sheath, bronze strap-distributor, a bronze strap-end made from a Celtic (probably Irish) book clasp and an iron sword (broken in three places) with an ornamented scabbard. Fragments of textiles were identified as the remains of a woollen cloak which had been worn by the deceased.

A crop mark of uncertain significance.

A crop mark of uncertain significance.

A crop mark of uncertain significance.

When the buried soils beneath Cronk Mooar burial mound, 1069.00, were excavated in 1945, six infilled post holes and shallow depressions were found to the north and northeast of the grave. These were  interpreted as the remains of a Neolithic settlement site.  In the south part of this area, were a series of plough marks and a probable field boundary scratched into the untouched soil; in three places these cut through the earlier post holes. The plough marks and field-boundary ran parallel to the existing land divisions and were regarded as dating to the Viking period.

The findspot of an early prehistoric flint scatter.

A mound with a peripheral ditch and associated banks and ditches which has been interpreted as the site of a possible Iron Age round house.

When the buried soils beneath Cronk Mooar burial mound, 1069.00, were excavated in 1945, six infilled post holes and shallow depressions were found to the north and northeast of the grave. These were thought to be associated with the flints and eroded prehistoric pottery found here and interpreted as the remains of a Neolithic settlement site.  In the south part of this area, were a series of plough marks and a probable field boundary scratched into the untouched soil; in three places these cut through the earlier post holes. The plough marks and field-boundary ran parallel to the existing land division and were regarded as Viking, 1069.30. Finds from the excavations are kept in the Manx Museum.

The site of a Bronze Age bowl barrow. The site has been ploughed over but survives as a grass-covered, ditchless mound measuring 31 metres in diameter and up to 0.8 metres high. In the past, several urns have been found at this mound, exposed by ploughing.

The site of an early medieval chapel or keeill and its associated burial ground, which are thought to date to the period AD500 to AD1000.   Two fragments of granite quern-stones have been found here as well as two boulders with incised linear crosses (Manx Cross No 13 and Manx Cross No 16) which are now kept in Jurby church, with casts kept in the Manx Museum. They are pre-Viking in date.

The site of an early medieval chapel or keeill and its associated burial ground, which are thought to date to the period AD500 to AD1000.   Two fragments of granite quern-stones have been found here as well as two boulders with incised linear crosses (Manx Cross No 13 and Manx Cross No 16) which are now kept in Jurby church, with casts kept in the Manx Museum. They are pre-Viking in date.

This cross slab is one of a group dating to the 6th to 12th centuries AD which have been found at or near St Patrick's church, Jurby. It is a flat water-worn boulder with cross incised on one face. It measures 37 centimetres by 16.5 centimetres by 5 centimetres. It is kept in the north porch of Jurby Church and a cast is kept in the Manx Museum.

This cross slab is one of a group dating to the 6th to 12th centuries AD which have been found at or near St Patrick's church, Jurby. It is a small boulder with a plain cross incised on one face. It  measures 30.5 centimetres by 22 centimetres by 13.3 centimetres.  It is kept in the north porch of Jurby Church and a cast is kept in the Manx Museum.

A cairn marking a large burial mound situated on the summit of the hill. The centre of the cairn stands to a considerable height.  Kerb stones set on edge are traceable in places around the circumference of the mound. The cairn has not been excavated but is probably early Bronze Age or late Neolithic in date.

The name means 'Hill of the Watch by Day' or 'Hill of the Day-Watch' and the hilltop would have been one of several medieval or early post-medieval watch and ward posts placed at strategic points round the island.  Every coastal parish had at least one 'hill of the day-watch' and 'port of the night-watch'.

This is the site of a modern aviation radio direction beacon, operated by National Air Traffic Services.  The site has been used since the 1950s for radio beacons providing navigation information for civil aircraft. The Ordnance Survey 1:10560 scale mapping published in 1958 shows a central mast next to a technical building, around which four more masts are marked to the NW, NE, SE and SW, at a distance of approximately 80 m.  The concrete foundation pads of the northerly masts have been removed, but the southern pair survive.  The historical mapping bears the annotation, 'Automatic Wireless Transmitting Direction-finding Station (Aircraft) (Min[istry] of Trans[port] & Civ[il] Av[iation])'. The mast array was for many years replaced by a low-level arrangement known locally as the 'Bandstand', which itself is in the process of being partially dismantled and replaced (as of 2021).

A Bronze Age funerary urn was reputedly found in this area and recorded by Kermode in 1930. No futher details are known.

The cropmark of a feature described as a "double-ring" seen to the south of a gully in the 1970s and thought to possibly represent an Iron Age roundhouse. No further information is available at present.

Medieval burial mound. This well-preserved burial mound stands in a prominent location on the coast. Coastal erosion is likely to have brought the mound closer to the shore than when it was originally created, but the surviving topography would suggest that it was designed to be visible from out to sea, and it bears direct comparison with nearby excavated sites such as Ballateare and Cronk Mooar, and disturbed examples such as that within Jurby churchyard. The sharply defined outline of the mound, which is 19m in diameter and 3.5m high, would tend to confirm its medieval, rather than prehistoric, origins. The mound is locally known as Cronk ny Arrey Lhaa, or 'hill of the daytime watch', for which purpose it could have served well. A document dated to 1627 and contained within the Castle Rushen Papers, however, states that the day and nightime coastal watches were by then kept from Knockmore (now Cronk Mooar) 1200m to the south-west.

The mound is known as Cronk ny Arrey Lhaa, or 'hill of the daytime watch', for which purpose it could have served well. A document dated 1627 and contained within the Castle Rushen Papers, however, states that the day and nightime coastal watches were by then kept from Knockmore (now Cronk Mooar) 1200m to the south-west. It is not impossible that the site may have served this purpose during medieval times before being superseded by Cronk Moar.

The site of a Bronze Age barrow, which survives as a ditchless, gorse and fern covered bowl barrow with diameter of 12.0 metres and height of 1.4 metres.  It has several stones, some of them quartz, exposed on the mound.  A second barrow lies 50 metres to the northeast (PRN 0532.00).  The barrow is shown as a Tumulus on the 1870 1:2500 scale Ordnance Survey map. Cronk ny Keeill Bouyr means the Mound of Keeill Bouyr (Mound of the Chapel of the Deaf).

Defended promontory. When first surveyed by the Ordnance Survey in 1868, the most obvious features on the site were the large, grass-covered bank, standing 3.5m high and 5m wide, and the less substantial remains of a rectangular building behind it on the promontory. The scale of the bank led to an assumption that it represented a prehistoric burial mound, a belief compounded by its name, which translates as 'hill of the dead'. Excavation in 1950-51 found that the promontory had first been protected by a timber stockade, which was later replaced by a timber-reinforced earthen rampart. A ditch had also been excavated in front of the bank, to a depth of about 1m below modern ground-level; the ditch was spanned by a causeway at the west end to allow access to the headland. The rampart was further augmented by a timber platform, or raised walkway. The defensive site so created was considered to be of Iron Age character, though no features of this period were identified within the site. Several residual finds, however, confirm an Iron Age presence. The interior of the headland is now dominated by a later longhouse which is likely to have disturbed or destroyed most traces of earlier occupation. The longhouse measures 13.5m by 7.5m, with earthen walls 1.5m thick faced inside and out in stone. The walls originally stood to a height of around 1.5m, and probably supported a pitched roof. Two doorways are located opposite each other near the west end, and low stone benches run along both of the long walls and across the western gable. There was little evidence of domestic activity, only rather basic remains of a hearth, and no domestic rubbish. The form of the building thus conforms to a domestic Viking longhouse, while the excavated evidence suggests that it was not permanently occupied. Several other defended promontories (Cass ny Hawin, Close ny Chollagh and Borrane) have similar buildings within their ramparts, leading to the suggestion that existing promontory forts were reused as part of a 'watch and ward' system of coastal defence and perhaps also to police beach markets. No dating evidence was found during the excavations but in 1970, a half-penny of Edward I, dating 1280-81, was found in the back-fill of the dig and presumably indicates some occupation of the site after the end of Norse rule on the Island in 1265.

Defended promontory. When first surveyed by the Ordnance Survey in 1868, the most obvious features on the site were the large, grass-covered bank, standing 3.5m high and 5m wide, and the less substantial remains of a rectangular building behind it on the promontory. The scale of the bank led to an assumption that it represented a prehistoric burial mound, a belief compounded by its name, which translates as 'hill of the dead'. Excavation in 1950-51 found that the promontory had first been protected by a timber stockade, which was later replaced by a timber-reinforced earthen rampart. A ditch had also been excavated in front of the bank, to a depth of about 1m below modern ground-level; the ditch was spanned by a causeway at the west end to allow access to the headland. The rampart was further augmented by a timber platform, or raised walkway. The defensive site so created was considered to be of Iron Age character, though no features of this period were identified within the site. Several residual finds, however, confirm an Iron Age presence.

Medieval longhouse. When first surveyed by the Ordnance Survey in 1868, the most obvious features on the site were the large, grass-covered bank, standing 3.5m high and 5m wide, and the less substantial remains of a rectangular building behind it on the promontory. The interior of the headland is now dominated by a later longhouse which is likely to have disturbed or destroyed most traces of earlier occupation. The longhouse measures 13.5m by 7.5m, with earthen walls 1.5m thick faced inside and out in stone. The walls originally stood to a height of around 1.5m, and probably supported a pitched roof. Two doorways are located opposite each other near the west end, and low stone benches run along both of the long walls and across the western gable. There was little evidence of domestic activity, only rather basic remains of a hearth, and no domestic rubbish. The form of the building thus conforms to a domestic Viking longhouse, while the excavated evidence suggests that it was not permanently occupied. No dating evidence was found during the excavations but in 1970, a half-penny of Edward I, dating 1280-81, was found in the back-fill of the dig and presumably indicates some occupation of the site after the end of Norse rule on the Island in 1265.

Medieval watch place. The excavated evidence suggests that the site was not permanently occupied during the medieval period. Several other defended promontories (Cass ny Hawin, Close ny Chollagh and Borrane) have similar buildings within their ramparts, leading to the suggestion that existing promontory forts were reused as part of a 'watch and ward' system of coastal defence and perhaps also to police beach markets.