They are interbedded with unfossiliferous sandstones and shales. All the rocks found on the island are sedimentary, such as limestones, mudstones and sandstones. The inner and midfan system contains interbedded thin to medium bedded sandstones and mudstones. Once this receded, conglomerates, sandstones, and shales accumulated. Well sorted volcanoclastic sandstones, siltstones and mudstones are found in this system. It contains non-red lithologies, green mudstones, siltstones, fine sandstones and yellow sandstones. The Pico Member is mostly made of massive siltstones and sandstones interbedded with minor silty-sandstones. The dominant lithology of this unit is mudstone with some interbedded sandstones. They are primarily Eocene sandstones, turbidites, and basaltic oceanic crust. The line will mainly be bored through East Coast Bays Formation of sandstones and siltstones. The Ocoee Supergroup consists primarily of slightly metamorphosed sandstones, phyllites, schists, and slate. This group consists of metamorphosed sandstones, phyllites, schists, and slate. And the mustard yellow color for the calcareous sandstones rich in sulphurous minerals. In some sandstones, the cement is calcareous. Devonian sandstones (the Old Red Sandstone) from the Brecon Beacons has been used.