“…2). Sedimentary strata of the Shaler Supergroup, a 4-km thick succession of carbonate and evaporitic rocks (Young, 1981;Rainbird et al, 1994Rainbird et al, , 2014 are intruded by Thorsteinsson and Tozer, 1962). Location of study sites Gossan Hill (GH) and Sill Gossan (SG) shown as yellow triangles on map.…”