De. SB1 Peñablanca
Narrow-mouthed pit with a 17-metre vertical shaft in heavily fissured limestone, near Roncal.
EspeleoWorld
De. SB1 Peñablanca
Narrow-mouthed pit with a 17-metre vertical shaft in heavily fissured limestone, near Roncal.
Roncal/Erronkari
Sviluppo: 22 m · Profondità: 17 m
Scheda aggiornata
https://espeleoworld.com/it/c/de-sb1-penablanca-roncal-erronkari
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Narrow-mouthed pit with a 17-metre vertical shaft in heavily fissured limestone, near Roncal.
Descrizione
Morfologia
We find a very narrow entrance, which leads into a vertical shaft of 17 metres. This shaft is a joint widened by the passage of water, as shown by the flutes and the verticality of the wall. At the bottom we can find a sandy plug produced by the breakdown of the roof of the pit, which coincides with the floor of the hill. The exterior of the pit is highly fragmented due to the strong influence of frost shattering in the area.
Progressione
Exploring the pit is dangerous because of falling stones.
Altri dettagli
A couple of chough nests have also been found, which, given their good state of preservation, are thought to be recent.
Storia
1994 Investigation Roncal Otxola
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Fonte: Gobierno de Navarra – Catálogo espeleológico de Navarra (datosabiertos.navarra.es), modificato. CC BY 4.0, https://creativecommons.org/licenses/by/4.0/ Gobierno de Navarra · dati aggiornati a 2022