Bòfia de la Matella de les Planes

Small entrance about 50 centimetres in diameter. Shaft developed on an N-S joint, inclined 70º towards the W and 3.5 x 0.75 metres in section, which descends to – 13 metres. Here there is a ledge and two openings, one of them impenetrable and the other a hole 1 x 0.6 metres that leads to the ceiling of a chamber via a 4 metre drop that leads to the top of a debris cone. The floor descends at a slope of 32º from – 17 to 21.5 metres, covered by small clastic debris.

At – 21 metres begins a remnant of gallery choked by the debris cone and where the maximum depth is reached.

The final chamber is of clastic origin and has small coverings of wall concretions, and at the bottom, at the S end, some small helictites on the ceiling.

Temporary stream sink. The morphology is of typical erosion, the walls of the shaft are finely polished by the action of water, favoured by the marly composition of the limestone.