Hidden in a cliff face on the high Marlbank, Pollasumera is where the Owenbrean sinks after journeying down the great Cuilcagh mountain. Despite the massive entrance, set in dramatic 20 meter high cliffs, the cave regularly floods to the roof and passageways become logged with washed-in debris such as dead wood, fence posts and some more unusual items.
Inside the entrance the scalloped walls are impressively coloured with many calcite inclusions and calcite flows
Beyond the great entrance the passageway continues north but soon changes west as it begins to stoop to crawling size. The river sinks and makes its way south to Marble Arch via Pollnagollum Of the Boats. A similarity shared between ‘Sumera and those bigger caves can be seen in the same quality of dense and pure limestone laid down in massive beds. There are few chert bands and the solid walls are well scalloped from a millenia of bearing large torrents.
An unusual flow of sharp stalactites covered in a sheath of rougher calcite
After the stream sumps there are some dry passages that continue south. They become very tight and blocked with calcite barriers and but eventually lead to Leeds Hall, the last relatively big chamber.
Around this area it is poorly surveyed and the route is constantly open to change with many once ‘obvious’ passages becoming choked up with mud and and washed-in debris. This highlights the ability of the cave to flood quite rapidly and aggressively. On my last visit signs of such recent flooding could be seen clearly, when high walls and the ceiling were still covered in a thick layer of foam that light up prettily under a caver’s lamp.
After The Flood: A caver sits beneath the floodline foam
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