The northern edge of the Systema Iberico is geologically complex, so much so that the area around Monestario del Piedra is a popular destination for students of Geology.

The high altitude vineyards to the south and east of Calatayud largely consist of slate and quartzite over sandstone from the tertiary period shaped by glacial activity. These soils, largely made up of stones and crumbled slate, are low in nutrients, well drained and planted mainly with bush-vine Garnacha.

Lower down, in the sub-valleys that feed the rivers Jiloca and Perejiles, the bedrock is more varied (including limestone and conglomerates) and the soils contain more clay, but vary from site to site. Some vineyards have a high calcareous content, while others contain high levels of quartzite stones on the surface.

The alluvial soils in the valley floors, generally have a fine texture and an absence of large stones or pebbles. These sand and silt based soils are mainly planted with international varieties such as Cabernet Sauvignon.



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