The Denault Formation is a Precambrian group of rocks, occurring in the Labrador Trough, which have an exceptionally high content of carbonate for the era.
The main mineral is dolomite.
Some sections are near-pure dolostone while others contain abundant chalcedony, chert, or quartz in mixture with dolomite.
[1] In the vicinity of Wabush, dolomitic marble and calcitic marble are present; some dolomitic marble sections contain inclusions of chlorite schist[2]