Richard Z. Poore, Lisa Tauxe, Stephen F. Percival, Jr., John L. LaBrecque; Late Eocene–Oligocene magnetostratigraphy and biostratigraphy at South Atlantic DSDP Site 522. Geology ; 10 (10): 508–511. doi: https://doi.org/10.1130/0091-7613(1982)10<508:LEMABA>2.0.CO;2
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Upper Eocene to lowest Miocene sediments recovered at Deep Sea Drilling Project (DSDP) Site 522 in the South Atlantic Ocean allow direct calibration of magnetostratigraphy and calcareous plankton biostratigraphy. The results from Site 522 show that the Eocene/Oligocene boundary occurs in the reversed interval of magnetic Chron C13 (= C13R) and that the Oligocene/IMiocene boundary probably occurs in the upper part of Chron C6C.