This Ordovician rock is composed of laminated mudstone and siltstone with greywacke sandstone. Internal layers of mudstone, conglomerate and siltstone interrupt the limestone horizontally. The grey coloring is mudstone, siltstone, and shale. The formation also includes lesser amounts of siltstone and mudstone. It consists mainly of silty brown shale and fine-grained sandstone and siltstone. Culmitzsch is a sedimentary deposit in Permian sandstone, siltstone and limestone. Wood Ranch is a slope-forming pale red and gray siltstone and dolomitic sandstone. The ecoregion is mountainous, forested, and underlain by Pennsylvanian sandstone, shale, and siltstone. This multicolored Triassic unit consists of shale, siltstone, and sandstone. Sedimentary rock composed mainly of silt is known as siltstone. It consists of sedimentary rocks such as sandstone, siltstone and claystone. After lithification, shale, siltstone, and sandstone are formed from the detrital deposits. This rock consists of shale, siltstone, and sandstone. The Vaqueros Formation is marked by two sandstone, siltstone and shale units. It left behind a layer of yellowish marine siltstone and sandstone rocks.