Figure F71. Biostratigraphic nannoplankton (NP) zonation, magnetic polarity data, and the suggested correlation with the geomagnetic polarity timescale (GPTS) at Site 1185.
The geomagnetic polarity timescale | U.S. Geological Survey
Magnetic Reversal - an overview | ScienceDirect Topics
Paleomagnetism - Wikipedia
Figure F50. Magnetic polarity data and suggested correlation with the geomagnetic polarity timescale (GPTS) at Hole 1186A. CNS = Cretaceous Normal Superchron.