Lithology
The Fernie Formation is composed of brown and dark gray and black shale which can be fractured of papery. Phosphatic sandstone and limestone, as well as cherty limestone occur locally in the lower parts of the formation; siltstone, sandstones, coquinas and oolitic limestone interbeds can occur in the middle; glauconitic sandstone and siltstone can be present in the upper parts. The facies becomes transgressional at the top towards the eastern reaches of the formation, the direction from where most of the sediments originated. Five depositional cycles can be recognized within the formation.
Read more about this topic: Fernie Formation