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A Wild theodolite was used from the nearest bench mark at 805.64 feet OD (in the woods above Loggerheads).Measuring the altitude of seven survey legs, each accurate to within one centimetre, led to the new datum point above the cave entrance.About 30m from the entrance, a letter-box slot opens at the point the dig broke into the cave.The passage at this point opens to 6m wide and high enough to stand.
The height of the cave entrance datum point (see photo below) was ascertained using a Distomat DI 10 survey instrument and a three-prism reflector.
This was about 0.7m high and 0.6m thick and had been left in situ by the 1970s excavators; it could represent the deliberate blocking of the entrance when it was used as a place of burial in the prehistoric period, something found at a number of cave burial sites in the region.........
and this potentially represents a rare survival of a feature of cave burials which, although recorded by 19th century excavators at many of the sites in north-east Wales, was always removed by them in gaining access to the deposits".
The second excavation by cavers with Mel Davies directing.
After just four hours work two bucketfuls of bones had been unearthed, many of which were obviously human.to the National Museum of Wales, Cardiff (but see 'Where are the bones today' below), on the clear proviso that they be returned to the area if ever a suitable museum is established in North Wales (NWCC newsletter No 1).