Magnetic susceptibility from the Blue Lias Formation from five sites in southern Britain, UK

The sites are Pinhay Bay to West Cliff, Lyme Regis (Dorset); St Audries Bay (Somerset); Quantocks Head (Somerset); St Marys Well Bay at Lavernock (Glamorgan); Southam Quarry, near Long Itchington (Warwickshire). Each data set includes: stratigraphic height; astronomically tuned time scale; composite time scale; vol MS (SI units); short eccentricity filter output; lithology of measurement; previously published bed number; ammonite biohorizon, ammonite subzone; ammonite zone.

In the case of limestone nodules within light marl measurements are made through the limestone nodules if they constitute 50% or more of the section along the bedding planes. For horizons with widely spaced limestone nodules (< 50% along bedding) light marl is measured instead. Volume MS measurement procedures are described by Weedon, Jenkyns and Page (2018).