Organic limestones and shales, many of them petroliferous, which contain ammonite aptychi, occur in the upper portion of the Jurassic series in the mountains northwest of Artemisa in Pinar del Rio Province. Numerous exposures of similar aptychus-bearing rocks are found within areas of Cretaceous rocks throughout the entire island. For the most part these exposures are too small to permit their appearance on a small scale map, but they do indicate that these organic and petroliferous rocks are present below most of the younger sediments.1

Marjorie O’Connell has published photographs and descriptions of these aptychi.2 She states that...

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