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U–Pb geochronology of exotic igneous cobbles, together with detrital zircons from a nearby\udsedimentary heavy mineral band from the Glenshirra Group (basal Dalradian Supergroup), provide\udinformation on the age and nature of the adjacent crystalline basement that supplied detritus to the\udDalradian Basin in the late Neoproterozoic. The igneous cobbles were sampled from a metaconglomerate\udinterpreted as debris-flow deposits from a local igneous basement hinterland.\udA granite cobble, and detrital zircons from a nearby psammite, gave c. 1800 Ma ages, indicating\udderivation from a presumed local Ketilidian–Makkovikian source akin to that exposed on Inishtrahull,\udColonsay and the Rhinns of Islay. A syenite clast yielded crystallization ages of c. 1500 Ma\ud(zircon cores), followed by a subsequent metamorphism at 1470 Ma (zircon rims). This corresponds\udto coeval Mesoproterozoic events that affected the Pinwarian terrane of SE Canada and Newfoundland.\udThe Moine Supergroup and Glen Banchor Succession are unlikely sources of detritus for the\udGlenshirra Group, as palaeodrainage across the line of the future Great Glen Fault (in its pre-displacement\uddisposition) would largely derive from local basement to the west of the Moine Supergroup.\udWhilst the existence of nearby Ketilidian–Makkovikian basement has been noted previously, this\udstudy provides evidence that Pinwarian basement also lay adjacent to Scotland during the deposition\udof the early Dalradian basin fills. These data should be incorporated into palaeogeographical reconstructions\udat the time of the break-up of the Rodinian supercontinent in the late Neoproterozoic

Basement palaeogeography of late Neoproterozoic Scotland: constraints from exotic clasts within the lower Dalradian Supergroup