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Global correlation using magnetic susceptibility data from Lower Devonian rocks

¹ Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803, USA
² Department of Geology, University of Texas at Arlington, Arlington, Texas 76019, USA
³ Departamento de Geología - Paleontología, Universidad de Oviedo, Jesus Arias de Velasco, 33005 Oviedo, Asturias, Spain
⁴ Departement de Géologie, Institut Scientifique, BP 703 Rabat-Agdal, 10106 Rabat, Morocco
⁵ Repsol-YPF, Maxus Energy Corporation, P.O. Box 7050, The Woodlands, Texas 77387-7050, USA

Magnetic susceptibility data from marine rocks can be used for global correlation because of synchronous variations in global erosion. We show here correlations between magnetic susceptibility data from two Lower Devonian, biostratigraphically well defined sections, one in northwestern Spain, and one from the Anti-Atlas region of Morocco. Using the Moroccan outcrop section, we correlate to cuttings from a Bolivian well with minimal biostratigraphic control. Using the magnetic susceptibility data, we identify the Lower Devonian, Pragian-Emsian, and lower-upper Emsian stage boundaries in the Bolivian well samples.