During the Mississippian, a flysch sequence with dark shales and graywackes was deposited. Lenses of silicic tuff exist as evidence of limited volcanism. These later sediments were formed over a subduction zone which formed along southern Laurentia.
In the geological context, during the Mississippian period, a sequence of flysch deposits consisting of dark shales and graywackes was deposited. The presence of silicic tuff layers serves as evidence of limited volcanic activity in that region. These sediments were formed over a subduction zone that had developed along southern Laurentia.