Updated 19th November 2007; 23rd December 2008; 16th May 2009

Located near Cueva de los Caracoles (247). The 2m high entrance leads to a chamber with a 4m climb into a further small chamber. A deposit of prehistoric, iron agricultural implements, including ard-shares and a sickle, was found just inside the entrance. This chamber also contained prehistoric pottery, the remains of rims to 3 large urns.
The definitive article about the finds, with photos, line diagrams and a survey is found in Smith, Peter 1995a. A summary description of the finds (with line drawings and survey) is found in Ruiz Cobo Jesús and Smith Peter et al, 2001 and Barril Vicente Magdalena 2001: Pre-Roman Ard-shares in Cantabria details the plough-shares and puts the Matienzo finds in context. The pottery is compared with the assemblage found in site 2139 in Smith P, Corrin J and Ruiz Cobo J, 2008.
A web page of the line drawings and photographs (© 2007 Museo de Prehistoria y Arqueología de Cantabria) can be found here.
Reference Ruiz Cobo Jesús and Muñoz Fernández Emilio et al, 2009 compares the "Orza" type pottery to others in the Asón region.

Reference: material in file; Smith Peter, 1995a; Smith Peter and Ruiz Cobo Jesús, 1999; Ruiz Cobo Jesús and Smith Peter et al, 2001; Barril Vicente Magdalena 2001; Ruiz Cobo Jesús and Smith Peter, 2003; Smith P, Corrin J and Ruiz Cobo J, 2008; Ruiz Cobo Jesús et al, 2008 (survey); Ruiz Cobo Jesús and Muñoz Fernández Emilio et al, 2009; anon., 2016b (Easter logbook)
Entrance picture :
Underground picture(s):
Detailed Survey : 1:500  survey from Ruiz Cobo Jesús et al, 2008
Line Survey :
On area survey :
Survex file :