User:Chipperkwah/sandbox

The Sinbad Formation is a geologic formation in Utah. It preserves fossils dating back to the Triassic period. The Sinbad Limestone Member of the Moenkopi formation is made up of very thin to thick beds of yellowish-gray limestone, dolomite, quartz sandstone, siltstone and, conglomerate rock. These hold fossils of Meekoceras fauna from the lower Triassic stage of history. Long ago, the area was covered in shallow seawater, and this deposited the sediment that became the formation. The Sinbad Limestone Member is one of four in the San Rafael Swell including also the Black Dragon Member, Torrey Member and Moody Canyon Member. Named by Gilluly and Reeside in 1928, the Sinbad unit stands out in a siliceous clastic sequence as a lone carbonate unit. Through the Triassic period, the Colorado Plateau in which the Moenkopi resides was covered sometimes by the epicontinental sea that both eroded and deposited rock fragments, including those of other Moenkopi formations. The Sinbad ranges in color from orange to yellow to gray, and is made up of benches and cliffs depending on the thickness of the dolomite and limestone. Calcareous siltstone is also present, along with minerals quartz, feldspar, muscovite, limonite, hematite and pyrite. These minerals appear as silt, sand, impurities, and void fillings.