Thermal and Alternating Field demagnetisation data from Visean-carbonates from Meathop Quarry sampled in 2018. This covers the Martin Limestone Formation. MQ are sample codes sampled and data collection carried out by Tereza Kamenikova and Dr Mark Hounslow. The AF demagnetisation data flagged with a *G has a GRM correction applied along the lines described in Stephenson (1993). Data measured on a 2G instruments RAPID, with blank correction as in Hounslow(2019). File for of demagnetisaon data in in header and also described in the GM4Edit software (Hounslow et al. 2019). Sub-samples from main sample given codes like MQ2.1, MQ2.2 etc Hounslow, M.W. 2019. GM4Edit (v.5.6) - a windows program to manage, plot, export and manipulate palaeomagnetic magnetometer datasets. http://dx.doi.org/10.13140/RG.2.2.31877.91361/1.

The dataset created includes natural remanent magnetisation (NRM) of archive-half core sections recovered at nine sites (i.e. Sites U1422, U1423, U1424, U1425, U1426, U1427, U1428, U1429, and U1430) during IODP Expedition 346. NRM of the archive-half core sections were measured at every 5-cm interval resolution before and after 20-mT alternating field (AF) demagnetisation treatment. The dataset created also includes NRM of discrete samples taken from working-half core sections (typically one discrete sample per core from the longest hole at each drilling site). NRM of discrete samples were measured before and after a complete stepwise AF demagnetisation routine (up to 60-mT peak AF field). All NRM data collected were used to construct magnetostratigraphy for all sites drilled during Expedition 346. All data have been published in IODP proceedings Volume 346 (http://publications.iodp.org/proceedings/346/346toc.htm).