Avenc de les Aranyes

Small pit 14 m deep in the Montnegre (Tordera, el Maresme), on the southern slope of the serra de l'Avetar, below a path from Can Soler to Hortsavinyà.

Tordera • Maresme 72m 14m

EspeleoWorld

Small pit 14 m deep in the Montnegre (Tordera, el Maresme), on the southern slope of the serra de l'Avetar, below a path from Can Soler to Hortsavinyà.

Tordera · Maresme

Length: 72 m · Depth: 14 m

Updated record

https://espeleoworld.com/en/c/avenc-de-les-aranyes-tordera

Information can change. Always verify coordinates, access, weather, and cave conditions before setting out.

Topographic map of the main entrance — Main entrance · ICGC topographic map

Small pit 14 m deep in the Montnegre (Tordera, el Maresme), on the southern slope of the serra de l'Avetar, below a path from Can Soler to Hortsavinyà.

Characteristics

Type: Pothole
Municipality: Tordera
Region: Maresme
Unit: Montnegre, el
Length: 72 meters
Depth: 14 meters
Major Unit: Serralada Litoral
Lithology: Limestone
Updated on EspeleoÍndex: February 2, 2022

Location

On the southern slope of the serra de l'Avetar (Montnegre), below a path that leads from Can Soler towards Hortsavinyà. Coordinates and location very unreliable and which only indicate the area where the cavity appears to be located.

Entrances

Always verify coordinates and access conditions before setting out.

Avenc de les Aranyes
Elevation: 310 m
41.658956, 2.641053
UTM 31T (ED 50) 470208 4612178
Open in map Open in Google Maps

Download all entrances as GPX

Topographic

Avenc de les Aranyes - Topography, Tordera, Maresme

View image

Click to enlarge

Espeleoindex · CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/ · Image © its author.

Image 1 of 2

Photos

Avenc de les Aranyes - Photo, Tordera, Maresme

View image

Click to enlarge

Espeleoindex · CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/ · Image © its author.

Image 1 of 6

Description

Morphology

A 4-metre shaft with blocks wedged between its walls reaches at its lower part a slightly descending gallery ending in an intersection with a very narrow joint. At the foot of the small entrance shaft there is a new shaft, this one of 4.4 metres, which leads into a gallery that, towards the N becomes impenetrable after a few metres and in the opposite direction communicates with the lower mouth of the cavity. Shortly after the entrance through this mouth there is a small shaft of just over 3 metres that links with a gallery on a descending ramp where, after a narrow passage and a small step, it continues a few metres more until it becomes impenetrable and where the maximum depth is reached.

History

The discovery and first exploration of this pit took place in 1963 by members of the GIE of the Club Excursionista de Gràcia (Barcelona). During this exploration a new species of beetle was discovered. In the following years the cavity was only of interest to biospeleologists and remained practically unpublished. In 1981 it was rediscovered by members of the GE Badalona who, having no information about it, renamed it Avenc Perset, although they soon realised the error. In 2007, again people from the GE Badalona and the Grup Excursionista Malgratenc visited the pit and carried out a clearance that gave access to a new mouth and some small lower galleries. During the clearance, bone remains were found which, once studied by specialists, they estimated correspond to Homo sapiens and Cervus elaphus.

Bio

Insecta / Coleoptera / Leiodidae

Parvospeonomus urgellesi (Español, 1964) (Isidre Glez. Urgellés, 1-12-1963, first location)

Insecta / Coleoptera / Carabidae

Laemostenus (Pristonychus) terricola (Herbst, 1783)

Insecta / Diptera / Limoniidae

Limonia nubeculosa (Meigen, 1804)

Insecta / Orthoptera / Gryllidae

Gryllomorphini

Arachnida / Araneae / Agelenidae

Eratigena atrica (C.L. Koch, 1843)

Arachnida / Araneae / Leptonetidae

Leptoneta infuscata (Simon, 1872)

Arachnida / Araneae / Nesticidae

Nesticus cellulanus (Clerck, 1757)

Arachnida / Araneae / Pholcidae

Pholcus phalangioides (Fuesslin, 1775)

Arachnida / Araneae / Tetragnathidae

Meta bourneti (Simon, 1922)

Arachnida / Araneae / Tetragnathidae

Metellina merianae (Scopoli, 1763)

Chilopoda / Lithobiomorpha / Lithobidae

Lithobius sp.

(Source of the data: Dept. Artròpodes del Museu de Ciències Naturals de Barcelona)

User Comments (0)

No comments yet.

Be the first to share your experience!

Registered Explorations (0)

No explorations registered yet.

Bibliography

Borràs, J.; Miñarro, JM.; Talavera, F. (1982).- Catàleg Espeleològic de Catalunya (vol. 6): el Baix Empordà, el Gironès, la Selva, l’Osona, el Vallès Oriental i el Maresme: 290 pp. Ed. Políglota. Barcelona.
Español; F. (1965).- “Una interesante localización de Speonomus en calizas paleozoicas de la cordillera litoral catalana”. Speleon (15): 49-59. Universidad de Oviedo.

Nebot, M.; Hernández, T.; Llenas, M. (2009).- “Restes humanes i de fauna vertebrada descobertes a l'avenc de les Aranyes (Tordera)”. I Trobada d'estudiosos dels Parcs de la Serralada Litoral Central – V Trobada d'estudiosos del Montnegre i el Corredor: 239-243. Diputació de Barcelona.