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Paleomagnetic studies were conducted on Oligocene to Albian age sediments from DSDP Hole 53OA. A sequence of geomagnetic reversals was recorded in the sediments which correspond to seafloor magnetic anomalies 25 to 34. The lower 300 m of sediments at this site is characterized by normal polarity and corresponds to the Late Cretaceous magnetically Quiet Interval. Based on the absence of reversals at the bottom of this hole, we suggest that the basal sediments are no older than latest Albian. If there is no major discontinuity at the base of Hole 53OA, the age of the seafloor can be inferred to be close to the onset of the Cretaceous Quiet Interval—that is, slightly less than 110 m.y.

Magnetostratigraphy of Cretaceous and Early Cenozoic Sediments of Deep Sea Drilling Project Site 530, Angola Basin