[en] The Litchfield province is herein defined as the westernmost outcropping unit of the Pine Creek Geosyncline extending from the Giant's Reef Fault at about longitude 130⁰50'E westerly to the edge of the Bonaparte Gulf basin. The northern half of the province has been remapped using company drillhole data and a Bureau of Mineral Resources air magnetic-radiometric survey. Five areas have been found to be entirely granitoid, garnetiferous and gneissic in part, with composition in the range adamellite to granodiorite. A single Rb/Sr age of about 1800 m.y. has been published. The granitoid margins are migmatised and transitional into large areas of metasediments, varying in metamorphic grade from greenschist (fine grained chloritic graphitic schist) to upper amphibolite/granulite grade (course grained quartz - feldspar gneiss). The regional strike is northerly to northwesterly, and these metasediments are thought to merge into the Burrell Creek Formation beyond the border of the province. Two periods of metamorphism affected the Litchfield province metasediments, but only one phase can be detected in the granitoids, thus these are assumed to be younger, probably formed during the 1800 m.y. orogenesis known elsewhere in the Geosyncline. Minor areas of unmetamorphosed gabbro, dolerite and quartz-diorite occur, probably of Middle Proterozoic age. Cover rocks include quartz sandstones of the Middle Proterozoic Moyle River Formation and Depot Creek Sandstone, and Cambro-Ordovician sandstones of the Daly River Basin. The formation boundaries in the Litchfield province are not particularly confused or complicated, nor are the igneous lithologies particularly diverse. There is no evidence for an Archaean age for the part of the Litchfield province north of the Daly River, and it is thus proposed that the term 'Litchfield Complex' should be abandoned. (author)