#GeoVuelta – stage 4. The first stage on Spanish soil brings the peloton through the El Torruño soils – the Rioja terroir that is a close relative of the Bordeaux wines of southern France. Logical: sediments of both regions came from the Pyrenees, mixed with calcium carbonate. 
The #geology of northern Spain consists of rocks that were deformed between 80 and 20 million years ago when the Pyrenees formed (more about that later), and to the south a large basin of the Ebro river, that today transports sediments to the #Mediterranean Sea...
The Ebro only reached the #Mediterranean 8 million years ago. Before, the basin was an enormous, elevated lake (making Rioja soils), until erosion of the Catalan Mountains connected it to the coast, as shown by Spanish geologist @danigeos in this clip!
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