bedrock, with a depth of about 400 m, is made up mainly of sedimentary minerals. In the Spessart is found a great deal of bunter. This geological plain with a slight slope to the southeast is the product of a large continental sea that drained owing to a tectonic shift. In the east, the range is abutted by the Fränkische Platte (a flat, mostly agricultural region), whose geology is mainly Muschelkalk-based.

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