However, I can share this instead. I adapted BRGM geological map s which are available on line to make the first image below. These maps do not translate well directly from the internet so it takes a lot of work to rebuild them and make them more understandable.
Decoding these maps is always a challenge for there is no legend to be easily found. The one on the site is so generic that it is essentially useless.
These codes came from a geological report of Libourne This is the fourth in a series, the first three were specifically on Pomerol but this widens it up to the full Plateau. Best, Dean. Having covered Pomerol in too much depth for many we will move our focus now to encompass the entire plateau. The best way to understand the soils of the plateau is to group them by sedimentary type, their time of their disposition, and finally the stage of development.
The earliest subaerial sequence material that is exposed to oxidation and weathering was laid down when the Atlantic Ocean was still expanding and water still covered Bordeaux and much of western France. At this time, Burgundy was much farther along in its development having become subaerial around 40 million years earlier.
This included the rift faults that created the escarpment and the graben we know today as the Saone Valley. Additionally, those pressures pushed up of the hills of the Hautes-Cotes. It would be for another five to seven million years until sedimentation of the oldest surface formations found in the Right Bank would begin to develop during the Oligocene. Strictly speaking, all deposition sequences layers of material occurs as a product of standing water. And although fluvial river flow and alluvial surface flows do deposit material, these deposits are the product of weathering and erosion of materials that were transported from higher elevation to a lower location via these flows of water.
