Bortzerreketa
A cavity in the Baztán Valley with a large sinkhole funnel, two levels and an 11 m pit that reaches a depth of 75 m.
EspeleoWorld
Bortzerreketa
A cavity in the Baztán Valley with a large sinkhole funnel, two levels and an 11 m pit that reaches a depth of 75 m.
Baztan
Sviluppo: 570 m · Profondità: 75 m
Scheda aggiornata
https://espeleoworld.com/it/c/bortzerreketa-baztan
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A cavity in the Baztán Valley with a large sinkhole funnel, two levels and an 11 m pit that reaches a depth of 75 m.
Descrizione
Morfologia
The mouth of the cavity is a large sinkhole funnel, where it divides into two levels. The first is meandering and presents some technical difficulties because of the narrow and "wet" passages, as well as several bottomless passages. The lower level is of larger dimensions.
Concrezioni
The lower level has an abundance of reconstruction phenomena.
Idrologia
The cavity is formed by a fault and receives the waters of several springs at its head, one of which sinks into this cave, the closest to Beretzako Borda. The bottom is reached at a depth of 75 m, in a suffocating flat-out passage that carries the waters in search of EZ-2.
Progressione
From the first level, meandering, an 11 m pit of delicate access is reached that leads to the lower level. The bottom is reached at a depth of 75 m.
Altri dettagli
It is one of the most interesting cavities of the aforementioned valley. Its first known visits go back to the inhabitants of the place, who visited it to see its beautiful formations and obtain "candles", it being necessary to use ropes of the period inside, whose remains stay within it.
Storia
Later, speleologists of the I.P.V. explored the cavity more seriously back around the year 1974. In 1953, Institución Príncipe de Viana. In 1992/3, E.R.E. del C.E.C. In 1994, Investigación Ezcaldo G. Satorrak.
Note biospeleologiche
Bortzerreketa-Gartzain: Gastropod, Arachnida, Acarina, Carabidae.
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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