Tag Archives: raw material

Radiolarite and spring in the Fribourger Prealps

A number of raw materials were used for the production of chipped stone artefacts at the site of Arconciel/La Souche, Kt. Fribourg, Switzerland. Some of you might already know that I am doing a use wear analysis of the finds from the Late and Final Mesolithic abri for my PhD.

Of course, I am curious to see these places and the sources of the raw material of the archaeological artefacts. And it is spring! Here on the Swiss plateau the snow is gone, and in the Alps much has already melted as well. So, with a trusted companion I set out on an expedition to go and find the radiolarite outcrops in the Fribourger Prealps on the Brendelspitz. As guides we had the article by Braillard etal 2003 and the great little book Geologischer Pfad Gastlosen by Braillard and Rebetez (2010) (thank you Luc!).  What these, sadly, did not tell us, was that we underestimated Lady Winter’s resilience and had to fight through leg-deep snow at times. And no, we did not bring snowshoes… By then, we were too foolhardy and just had to get up there!

Radiolarite Braillard etal2003 web

various types of radiolarite, from Braillard etal 2003

The main raw materials used at the site during the Mesolithic are “Ölquartzite”, radiolarite and flint (Braillard, Menoud et al. 2003; Mauvilly 2005; Mauvilly, McCullough et al. 2008). Most of these raw materials are to be found at a not too great distance from the site of Arconciel/La Souche. The closest source would have been the Sarine riverbed. Radiolarite, “Ölquartzite” and some types of flint can be found there. In the Jura Mountains further flint sources are known. Sources of “Olquatzite” and radiolarite are known in the Fribourger Prealps, the range of middle high Alpine mountains in the southern parts of the canton, and in the neighbouring areas of the Bernese Oberland[1]. But I will focuss only on the radiolarite in this post. Continue reading