Abstract

Nodules in Toarcian (Jurassic) limestones at Saint-Antonin in the valley of the Aveyron, southwestern Quercy, France, which resemble oolites but lack the concentric structure, are described and attributed to deposition of calcite around a nucleus in one single stage. Petrographic study of the limestones also reveals that dolomitization, phosphatization, and silicification have taken place simultaneously, probably as a result of biochemical processes.

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