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Here's that shot of the topsoil of Vieux Château Certan. It's been many years since I studied soil science, but this seemed to be to be a clay/sand mix. Due to the extreme dryness the region has been experiencing, it does come across as being rather dusty.
As I pointed out to a number of the Bordelais, when the UK is suffering drought at this time of year the rest of Europe should start feeling some concern!