ARF7
A 6-metre-diameter collapse doline containing an elliptical shaft 16 metres deep, developed in Eocene calcarenites.
EspeleoWorld
ARF7
A 6-metre-diameter collapse doline containing an elliptical shaft 16 metres deep, developed in Eocene calcarenites.
Valle de Yerri/Deierri
Sviluppo: 2 m · Profondità: 16 m
Scheda aggiornata
https://espeleoworld.com/it/c/arf7-valle-de-yerri-deierri
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A 6-metre-diameter collapse doline containing an elliptical shaft 16 metres deep, developed in Eocene calcarenites.
Descrizione
Morfologia
This feature lies within a doline 6 metres in diameter with steeply sloping walls, which attest to its collapse morphology. At the bottom of this doline opens the mouth of a shaft with an elliptical cross-section. The area of the cross-section increases progressively with descent. The morphology of this shaft originates from a primitive N-S-trending joint, which evolved to its current dimensions through intense karstification. At the bottom it connects with another parallel shaft of smaller dimensions, which has the same shape as the entrance shaft. The bottom of both shafts is choked with debris at a depth of 16 metres.
Altri dettagli
The cavity develops entirely in Eocene (Lutetian) tabular calcarenites with practically horizontal dips.
Storia
2007 Research Urbasa G.E.E
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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