The large stratiform and differentiated mafic to ultramafic Lac Doré intrusion was originally identified as the Lac Doré Complex (Allard, 1956, 1976). This name, emphasizing the analogy with stratiform layered complexes such as Bushveld or Stillwater, was maintained by Daigneault and Allard (1990) for historical reasons, despite the recommendations of the North American Stratigraphic Code regarding the use of the term “complex” (Articles 37d and 38; MER, 1986). The most recent version of the North American Stratigraphic Code (NASC, 2005) maintains that it is incorrect to use the term “complex” to refer to “various types of rocks belonging to a single class”. For this reason, Leclerc et al. (2017) propose the following changes to the nomenclature of the Lac Doré Complex in accordance with sections 31 to 41 of the North American Stratigraphic Code: a) the Lac Doré Complex is renamed the Lac Doré Intrusive Suite; b) the Lac Doré Lower Series, Layered Series and Upper Series become the Lac Doré Lower Unit, Layered Unit and Upper Unit respectively; and c) the Layered Zone, included in the Layered Series (former nomenclature), is now referred to as the “layered zone” and is considered an informal lithodeme.

The Lac Doré Upper Unit consists of the border zone and the granophyric zone.