Esquerda Nº1 del Mas de les Fonts

Although the first exploration is attributed to Font i Sagué, and he mentions it in his catalogue, nowhere does he say that he has been there. In the article on the Font d'Armena he does not even mention it.

Rafael Amat i Carreras explores it for the first time on 24 August 1925 and names it Esquerda del Mas de les Fonts. He considers that he may have descended to -50 metres, throws a stone and calculates that the fissure descends some 50 metres further.

In 1963, the people of the Club Muntanyenc Barcelonès explored it again and give it a depth of 40 metres. They also call it Esquerda del Mas de les Fonts.

At the end of the 70s it is explored by the ERE of the CEC, where they cite the different fissures as Penya Esquerdada, with different numbers to identify them, in this case number 1.

On 28 November 1995 it is explored and surveyed by members of the SEO-CE Vallirana, they name them with the initials SM-3/4.

Troglocharinus Ferreri Reitt.

13 specimens collected in August 1936 by Noel Llopis Lladó.

14 and 32 specimens collected respectively on 6 April 1975 and 11 September 1976 by Oleguer Escolà i Boada.