 During the lower Jurassic period, a marine environment existed in the area allowing for the deposition of interbedded carbonates and evaporates.During this upper Jurassic period, the deposition of oolitc limestones, shales and carbonated cemented sandstones were deposited in the basin.The deposition of these sandstones creates ideal seismic reflectors to aid in the understanding of formations deep within the Jeanne d'Arc Basin.