Mojon 37-O

The entrance of the cavity is low, giving onto a steep ramp with allogenic and clastic deposits. Along the ramp, a few metres into the descent, one reaches a ledge with a detrital floor. The main gallery is formed by a phreatic-type section, whose diameter exceeds 4.5 metres. After a further 90° turn to the right one comes to a vertical step of 3.6 metres, facing a new gallery that crosses perpendicularly and shows two different types of morphology. In the lower part of the gallery the dominant morphology is clastic, showing large blocks distributed randomly, with a great chaos at the back that blocks the gallery. The section of this is clearly phreatic. The blocks are of decimetric size with moderately sharp edges, their faces being more or less dirty with decalcification clay. It would be interesting to carry out a major clearance in the block chaos at 24.7 metres depth, due to the large size of the gallery section, being able to reach, with almost full certainty, much deeper levels.

To the left of the new gallery a large number of reconstructive processes appear, finding it full of flowstone and gours, the latter of small size. In this zone there is a very narrow shaft between flowstone, with an estimated depth of 5 metres. In the phreatic section of the lower zone a lithogenic deposit is shown on the floor in the manner of calcareous flowstone, also finding the whole zone covered by a thin layer of Moon milk.

On the left part there is a first water input, whose flow is very scant. From the ledge with a detrital floor, turning 90° to the left, a new input can be observed, very small, created by a paragenetic morphology in the main gallery. The very narrow shaft between flowstone acts as a sink for four small galleries that contribute small flows. A fifth crawlway shows a clogging of rounded pebbles of the Triaxal type, which are semi-cemented by little-hydrated sandy clay.

Along the ramp, a few metres into the descent, one reaches a ledge with a detrital floor from which, turning 90° to the left, a new input can be observed. After making a further 90° turn to the right, one comes to a vertical step of 3.6 metres, facing a new gallery that crosses perpendicularly.