W. Lowrie, J.E.T. Channell; Magnetostratigraphy of the Jurassic-Cretaceous boundary in the Maiolica limestone (Umbria, Italy). Geology ; 12 (1): 44–47. doi: https://doi.org/10.1130/0091-7613(1984)12<44:MOTJBI>2.0.CO;2
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The magnetic stratigraphy of a 110-m section of the Early Cretaceous Maiolica pelagic limestone in the Bosso valley (Umbria, Italy) shows clearly defined magnetozones that are correlated with the geomagnetic polarity record derived from the M-sequence marine magnetic anomalies M19 to M14, and possibly M13. Using an established paleontological zonation of this section based on calpionellids, the position of the Jurassic-Cretaceous boundary is located close to the base of the negative magnetozone corresponding to anomaly M17.