The Soil and Geology of the Arroyo Grande Valley

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Central Coast Vineyards in Arroyo Grande Valley are influenced by the transitional geology of the AVA. To the north of the region, the Coastal Mountain Range runs in a predominantly northwest direction. The San Luis Mountain Range runs roughly east-west to the south of the valley.

 Much of the Arroyo Grande Valley Floor is made up of ancient marine sediments from the Tertiary Period from the beginning of the Cenozoic Era. (2-65 million years ago) These sedimentary rocks and soils lie over ground that dates to the Jurassic and Cretaceous Periods. Also known as the Franciscan Complex, these older geological features are made up of a range of continental and marine rocks.

 The Soil and Geology of the Arroyo Grande Valley

The Franciscan Complex is one of the major enigmatic geological components that make up the soils of many of the best vineyards throughout California Wine Country. It is largely comprised of graywacke, limestone, chert and shale. There is also quite a bit of volcanic influence as the region is riddled with faultlines.

In short, the Arroyo Grande Valley AVA shares much rudimentary geologic makeup as other coastal wine regions in California.