"Describes an investigation carried out by surface radioactivity measurements in southwestern France in one part of the Aquitaine sedimentary basin. In the coastal area between Biarritz and St. Jean-de-Luz, a plug of gypsiferous Keuper shale is exposed between the Senonian-Turonian Bidache limestone on the north and the Paleocene limestone on the south. A radioactivity traverse was made from Cap Martin to Guethary on this coast and it is deduced from the results obtained that there is no evidence that the 'ophite' outcropping at the Rochers de Peyreblanque is of the same age as the Keuper plug, as has previously been suggested. Furthermore, the Keuper plug showed a remarkably high radioactivity which reached its peak about its geographical center."

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