We live in Stone Country. I have attempted to get beyond ‘limestone’ and ‘sandstone’ and can just about tell my nummulithic from your oolithic – but I soon find myself in alien territory, where they speak like this : ‘ . . . the origin of the paleodoline is interpreted as resulting from a combination [...]

Quid is France’s Encyclopedia Britannica, on paper since 1967 and online since 1997. IGN is the Institute Géographique National – it began as an army mapping service in 1887 and went public in 1967. They are invaluable tools in researching old stones but they are not without weaknesses. This is what I found for Siran, [...]