An erratic boulder with pertoglyphs
|(CH 1903)||E 721764||N 96969||H 520.0|
|(WGS 84)||Long. 9.011||Lat. 46.013|
Ethnographical, Didactic, Archaeological
Standing entirely on a base of Moltrasio Limestone, this imposing block of gneiss corresponds fully to the definition of an erratic boulder, that is, one which has been carried from one location to another by glacial ice. The position of the Predescia Boulder testifies to the presence of a glacier which transported and deposited it in its present position. In fact, during the Quaternary Period a branch of the Adda Glacier penetrated several times into the region of Gandria, Lugano, and Melide and even pushed as far as Mendrisio. It is assumed that the block was moved during the last important glacial event, namely the Cantu Glaciation, which took place 22,000 years ago.
After “Ristorante Gandria”, on the right side of the road, there is a large paid parking area about ten minutes’ drive from Lugano.
Go up the path which starts in front of “Ristorante Gandria” to La Madonna and then continue to the signposted turning which leads to the Predescia Boulder.
AA.VV. (1999): Sentiero naturalistico e archeologico di Gandria. 51 pp. Disponibile presso Lugano Turismo.
BINDA F. (1996): Archeologia rupestre nella Svizzera italiana. Armando Dadò Editore, Locarno, 224 pp.
COTTI G. et al. (1990): Introduzione al paesaggio naturale del Cantone Ticino. Vol. 1: Le componenti naturali, Bellinzona, 484 pp.
DECUYPER H. & ANTOGNINI M. (2008): Magie di pietra: paesaggi geologici del Ticino. Armando Dadò Editore, Locarno, 159 pp.