Avenc dels Bessons
A 39-metre-deep pit in the municipality of Sitges, with an entrance in the form of an elongated, narrow window measuring 0.7 x 0.3 metres.
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Avenc dels Bessons
A 39-metre-deep pit in the municipality of Sitges, with an entrance in the form of an elongated, narrow window measuring 0.7 x 0.3 metres.
Sitges · Garraf
Length: 67 m · Depth: 39 m
Updated record
https://espeleoworld.com/en/c/avenc-dels-bessons
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A 39-metre-deep pit in the municipality of Sitges, with an entrance in the form of an elongated, narrow window measuring 0.7 x 0.3 metres.
Topographic
Espeleoindex · CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/ · Image © its author.
Photos
Espeleoindex · CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/ · Image © its author.
Description
Morphology
Entrance in the form of an elongated and narrow window 0.7 x 0.3 metres that cuts laterally onto a shaft of -8 metres. At its base, a new narrow passage lets us enter a new shaft of -23 metres with characteristics similar to the entrance one, stepped by two small ledges and which in its final stretch gains volume thanks to lateral coalescence with a small vertical concavity with a blind vault. At the bottom of this second shaft two new verticals open up, one of 3.5 with no continuation and another of 8.3 metres with a very narrow access, where the point of maximum depth is reached at -39.8 metres. At this point a possible continuation has always been hinted at.
History
The avencs Ramon Valls, Bessons and Vell were known to Gilberto, who was a tenant farmer of the Pleta until the middle of 1964. In the early summer of 1958 this man accompanied members of the SES-Puigmal to the entrance of what would be the avenc Ramon Valls and which they fully explored on 17 August of that same year (not in 1960 as is said in the Garraf catalogue). The other nearby avencs were also explored by this group at the same time. As an anecdote from these explorations, it was heard said that Gilberto asked the people of the SES to dedicate the deepest avenc of those he had shown them to his two children, who were twins. But the people of the Puigmal gave it the name of a club colleague who had died shortly before, and the twins were left with the second in importance; this did not please the tenant farmer, and legend says that he never told them of other avencs he knew. In the Catàleg del Massís de Garraf (1) the original survey was published, made by its first explorers; but before that a survey made later of the avenc dels Bessons had already been published, accompanied by a data sheet (4). This last one has a curious peculiarity: the survey gives a depth of -38 metres, the data sheet states that it is -43 metres and a few lines further down the temperature is indicated at -50 metres depth.
Bio
Troglocharinus Ferreri Reitt.
1 specimen collected by Lluís Auroux on 4 October 1964.
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Bibliography
- Borrás Xavier, Joan. (1974).- Catálogo Espeleológico del Macizo de Garraf (II):1-166. Barcelona.
- Miñarro, Josep M. (1990).-“Revissió d'unes cavitats del Fondo de Vallbona”. Espeleosie (31):11-16. SIE-CE Àliga. Barcelona.
- SES Puigmal.(1958).-“Avenc Ramon Valls”. Cordada (42):11.Barcelona.
- Sitjà, R.(1967).-“Fitxes de cavitats: Avenc dels Bessons”. Espeleòleg (4):119-120. ERE-CE Catalunya. Barcelona.
- Fotos 'JNC' facilitades per Jordi Navarro, (Centre Excursionista de Castellar del Vallès).
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Source: Espeleoindex (espeleoindex.com), modified. CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/