Sacre Coeur
It is hardly surprising that many beliefs and physical objects have not been recorded, when such a large proportion of the population, who lived with these sayings, superstitions and monuments were illiterate. They could not record them themselves and of what interest to others were a few rocks in a field or a curious belief about the efficacy of touching wood. What wasn’t ignored by the educated part of the population was ruthlessly supressed by the Church. So many possibly pagan customs and sculptures were campaigned against by a whole variety of people in the name of the Church and of decency.
It took a change of the attitude and perception of the literate classes for these things to noticed, valued and recorded. By looking at the rocks with a different eye they could see a pattern that could suggest that they were remnants of another culture and not something left over from glacial drift.