19 20'Salt' giants are typically halite-dominated, although they invariably contain other evaporite (e.g. anhydrite, 21 bittern salts) and non-evaporite (e.g. carbonate, clastic) rocks. Rheological differences between these rocks 22 mean they impact or respond to rift-related, upper crustal deformation in different ways. Our understanding 23 of basin-scale lithology variations in ancient salt giants, what controls this, and how this impacts later rift-24 related deformation, is poor, principally due to a lack of subsurface datasets of sufficiently regional extent. 25Here we use 2D seismic reflection and borehole data from offshore Norway to map compositional variations 26 within the Zechstein Supergroup (Lopingian), relating this to the structural styles developed during Middle 27Jurassic-to-Early Cretaceous rifting. Based on the proportion of halite, we identify and map four intrasalt 28 depositional zones (sensu Clark et al., 1998) offshore Norway. We show that, at the basin margins, the 29 Zechstein Supergroup is carbonate-dominated, whereas towards the basin centre, it become increasingly 30 halite-dominated, a trend observed in the UK sector of the North Sea Basin and in other ancient salt giants. 31However, we also document abrupt, large magnitude compositional and thickness variations adjacent to 32 large, intra-basin normal faults; for example, thin, carbonate-dominated successions occur on fault-bounded 33 2 footwall highs, whereas thick, halite-dominated successions occur only a few kilometres away in adjacent 34 depocentres. It is presently unclear if this variability reflects variations in syn-depositional relief related to 35 flooding of an underfilled presalt (Early Permian) rift or syn-depositional (Lopingian) rift-related faulting. 36