Who was saying that they were dinosaur bones?

The first use of the term "fossil fuel" occurs in the work of the German chemist Caspar Neumann, in English translation in 1759.[22] The Oxford English Dictionary notes that in the phrase "fossil fuel" the adjective "fossil" means "[o]btained by digging; found buried in the earth", which dates to at least 1652,[23] before the English noun "fossil" came to refer primarily to long-dead organisms in the early 18th century.[24]