Other
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.104..226h&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 104, no. 2-4, June 1991, p. 226-244. Research supported by NWO.
Other
136
Earth Orbits, Eccentricity, Equinoxes, Orbital Elements, Periodic Variations, Precession, Geochronology, Geomagnetism, Mediterranean Sea, Paleomagnetism, Saprophytes, Sedimentary Rocks
Scientific paper
The astronomically calibrated age of the Olduvai Subchron is established by correlating the cyclic sapropel patterns in the Vrica section and in the sections of Semaforo (Italy), Singa (Italy), Punta Piccola (Sicily), and Francocastello (Crete) to the new astronomical solutions for the precession of the equinox and eccentricity of the earth's orbit, using inferred phase relationships between the sapropel cycles and orbital cycles. The resultant ages for the Olduvai and for older boundaries are then compared with conventional, as well as other orbitally tuned ages, for these polarity transitions. It is shown that this astronomically calibrated time scale can be extended back to the Miocene/Pliocene boundary.
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