Magnetostratigraphy of the Berriasian stratotype section (Berrias, France)

Details Magnetostratigraphy of the Berriasian stratotype section (Berrias, France) Magnetostratigraphy of the Berriasian stratotype section (Berrias, France)

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74..130g&link_type=abstract

Earth and Planetary Science Letters, Volume 74, Issue 1, p. 130-136.

Physics

25

Scientific paper

The Berriasian (Early Cretaceous) stratotype section (Berrias, Ardèche, France), 30 m thick, consists of well-bedded blue-gray pelagic limestone. The biostratigraphic subdivision of this section is based on ammonite and calpionellid zonations. Magnetostratigraphic study has yielded a reliable magnetic polarity sequence. Magnetite is the principal ferrimagnetic mineral and the characteristic remanent magnetization (ChRM) directions are clearly defined after thermal or alternating field demagnetization. Ammonite and calpionellid zones allow biostratigraphic calibration of the magnetic polarity sequence with precision on the order of an ammonite sub-zone. This magnetic polarity sequence can be correlated with marine magnetic anomalies M15 to M17n. M15 occurs within the upper part of the Boissieri ammonite zone while M17n occurs within the Occitanica ammonite zone.

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