and La Bastide-sur-l'Hers but this declined with the start of the 19th. An 1871 plan to import raw French jet into Whitby was unsuccessful due to its poor quality.

Spain

The jet found in Asturias, the biggest deposit in northern Spain, is of Late Jurassic (Kimmeridgian) age, about 155 million years old. Asturian jet is a perhydrous coal that suffered an anomalous coalification

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