Fermeuse Formation

On Bonavista Peninsula the depositional environment was a slope and outer shelf–below photic zone Turbidites probably were the dominant sediment transporters.^[5]

It is predominantly silts and sands, in contrast to underlying Trepassey Formation, which is mostly dark grey shales. There is a coarsening up sequence throughout the two formations, such that the top of the Fermeuse is predominantly sandstones.^[5] On Avalon Peninsula there were much shallower waters, particularly than in underlying Mistaken Point Formation and Trepassey Formation.^[1] It is indicated by sandy channel fills, slumping, occasional silts.^[1] There is a possible delta front and shallow slope setting.^[1]

The formations also contains the Inner Meadow Lagerstätte, a site which has been dated to 550.78 million years ago, placing it within the White Sea assemblage. It contains fauna primarily known from this formation and others within Newfoundland, alongside some rarer examples from other White Sea aged formations such as the Rawnsley Quartzite, although the exact location of the site is unknown, primarily due to provincial laws on significant fossil sites.^[6]