Abstract
On the reliability of the Matuyama–Brunhes record in the Sulmona Basin—Comment to ‘A reappraisal of the proposed rapid Matuyama–Brunhes geomagnetic reversal in the Sulmona Basin, Italy’ by Evans and Muxworthy (2018)
Highlights
The lacustrine Quaternary infill of the Sulmona basin mainly consists of bioinduced carbonate silt divided into three main sedimentary units
The units are geochronologically constrained by 40Ar/39Ar dating and tephrochronological determinations between about 800 and 90 ka (Giaccio et al 2012, 2013, 2015; Regattieri et al 2015, 2016, 2017)
The lowermost unit, SUL6, contains the Matuyama–Brunhes Boundary (MBB) and a number of tephra layers acting as reliable stratigraphic markers (Giaccio et al 2013; Sagnotti et al 2014, 2016) and chronological control points (Fig. 1a)
Summary
We confirm that samples from 30 to 36 cm above tephra SUL219, that are from about 4 to 10 cm above the MBB as determined by Sagnotti et al (2014, 2016), contain a reverse characteristic remanent magnetization (ChRM) isolated between about 200◦ and 400–450◦C, after removal of a low-stability overprint at 200◦C. A sample 49 cm above tephra SUL2-19 shows a well-defined ChRM (isolated between 200◦C and 390◦C) of normal polarity (Fig. 3a), consistent with results obtained from the other three sections at the same stratigraphic horizon (Sagnotti et al 2014, 2016).
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