The soil is of very varying nature, and consists in some districts of the so-called albariza (mainly chalk with some sand and clay), in others of barros, which is mainly sand cemented together with chalk and clay, and of arenas, which consists of nearly pure sand.
Most of the vineyards in the Jerez district are upon albariza soil, those to the north and north-east are mainly of barros, and those close to the seashore of arenas.
Thus, according to Thudicum, the regular heavy sherry from albariza soil remains immature for a number of years and then becomes a fino.
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