The stones were found in 1945 at a site of prehistoric artefacts or at a prehistoric settlement. As the site was already used as a quarry, nothing convincing could be said about the site's previous use. The stones were placed in front of the Church and can be viewed there.
Info taken from: Swiss Inventory of Stone Monuments, http://www.ssdi.ch, Objects No. 1359.02 and 1359.03. Please see my previous comment for the links.
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