As part of the current mapping programme aiming to produce a second edition of the PORT AUGUSTA 1:250k geological map sheet, 8 rock samples from outcrops located on this map sheet area and on the adjoining WHYALLA 1:250k map sheet area were radiometrically dated by U-Pb zircon methods on SHRIMP IIe at Geoscience Australia during 2014 and 2016. These samples were selected in an attempt to solve two major uncertainties about the stratigraphy on northern Eyre Peninsula: (i) the age range of the Hutchison Group, which has previously yielded maximum depositional ages ranging from Neoarchaean to Palaeoproterozoic, and (ii) the apparent need for reclassification of the ‘Lincoln Complex’, a correlative term originally conceived to describe the products of magmatism associated with the Kimban Orogeny, but where these are now known to comprise a grouping of unrelated rocks ranging from Neoarchaean to Palaeoproterozoic in age. Three samples were selected from Salt Creek, 30 km north-east of Cowell on the eastern margin of the Cleve Domain. Here quartzite and calc-silicate of the Warrow Quartzite, a formation within the Hutchison Group, are structurally interleaved with the Neoarchaean Minbrie Gneiss. Szpunar et al. (2011) proposed three divisions of the Hutchison Group; the ‘Middleback group’, thought to contain a Neoarchaean sedimentary sequence, and the ‘Cleve group’ and ‘Darke Peak group’, thought to contain two distinct Palaeoproterozoic sedimentary sequences. The proposed Archaean and Palaeoproterozoic divisions of the Hutchison Group are separated by a belt of felsic igneous rocks which host major shear zones formed during the Kimban Orogeny (1740–1690 Ma), The c. 2820 Ma Coolanie Gneiss, the Neoarchaean Minbrie Gneiss and the Hutchison Group at Salt Creek occur within this belt of rocks. The samples were chosen for dating from the Salt Creek location to test whether the Coolanie Gneiss represents a major tectonic boundary between the Palaeoproterozoic and Neoarchaean parts of the Hutchison Group. Sample 2014268, a quartz-feldspar-biotite migmatitic gneiss of the Minbrie Gneiss, yielded a magmatic crystallisation age of 2422 ± 5 Ma, similar to other known ages of the formation. Sample 2014264, from the Warrow Quartzite that is structurally interleaved with the Minbrie Gneiss, yielded a maximum depositional age of 2004 ± 10 Ma, similar to other published ages of the Warrow Quartzite. No change in zircon provenance is indicated by these results, suggesting that the Coolanie Gneiss does not delineate a major structural boundary within the Hutchison Group. Sample 2014267 is a weakly foliated granite which intrudes the Minbrie Gneiss. It contains only a few zircons, two of which produced concordant analyses at c. 2445 Ma and 1740 Ma. The latter might indicate that the granite was emplaced during the Kimban Orogeny, but based on only two grains, very little of geological significance can be interpreted. Five samples of various lithologies of the ‘Lincoln Complex’ from the Roopena area and the Cleve Hills were selected as part of a study to create a new stratigraphic nomenclature for magmatism associated with the Kimban Orogeny, viz. the Peter Pan Supersuite, and to reclassify those units within the ‘Lincoln Complex’ which predate the Kimban Orogeny and are therefore not genetically associated with this event. Sample 2017712, the Wortham Granite, is a pink medium-grained feldspar-quartz-biotite-tourmaline granite from the Roopena area, ~40 km west of Port Augusta. The very low zircon yield produced an upper intercept age 1747 ± 13 Ma. As with the weakly foliated granite from Salt Creek (2014267), this granite was probably emplaced during the Kimban Orogeny. Sample 2017715, the Tip Top Granite, is a pink medium-grained quartz-K feldspar-plagioclase-muscovite granite from the Roopena area. It yielded a magmatic age of 1773 ± 6 Ma, with a dominant component of inherited zircon at 1853 ± 6 Ma, probably derived from the Donington Suite, and shares strong similarities to the zircon age spectrum of the Wertigo Granite. Sample 2074175 is a porphyritic quartz-feldspar-biotite rock, interpreted to represent a deformed volcanic sill intruding the Katunga Dolomite at Fern Quarry in the Cleve Hills. It yielded a magmatic crystallisation age of 1720 ± 6 Ma, within uncertainty of many other granites associated with the Kimban Orogeny in the Cleve Domain. Sample 2074177 is a medium-grained equigranular quartz-K feldspar-plagioclase-muscovite granite which intrudes the Warrow Quartzite as a sill at Poornamookinie Creek, ~3 km north of Cleve. It was found to contain only a small number of zircons, two of which provide a maximum crystallisation age of c. 2010 Ma. With such a low zircon yield, it is quite possible that this is a Kimban-aged intrusion that did not crystallise magmatic zircon, but instead the few zircons it contains are inherited from the Warrow Quartzite it intrudes. Sample 2065418 is a quartz-muscovite metasediment interleaved with the c. 2820 Ma Coolanie Gneiss in the Cleve Hills. It yielded a maximum depositional age of 2517 ± 11 Ma, and is interpreted to be an equivalent to metasedimentary units of the Sleaford Complex which has been structurally interleaved with the Coolanie Gneiss during the Kimban Orogeny.