Recent mapping (1989-1992) by the Northern Territory
Geological Survey in the Tennant Creek 1:250 000 map sheet
area has resulted in substantial revision of the lithostratigraphy of
the Tennant Creek Block (Donnellan, Hussey, and Morrison, in
press). Briefly, the former Warramunga Group (Dunnet and
Harding, 1967; Dodson and Gardener, 1978) is divided into the
Warramunga Formation, and an overlying less deformed
volcano-sedimentary succession, the Flynn Subgroup. The latter
is conformably overlain by the Tomkinson Creek Subgroup of the
Tomkinson Creek province in the north of the Tennant Creek
Inlier. These two Subgroups constitute the Churchills Head
Group which is essentially equivalent to the Hatches Creek
Group of the Davenport province to the south of the Inlier.