Organ Rock Formation Organ Rock Formation The Organ Rock Formation or Organ Rock Shale is a formation within the late Pennsylvanian to early Permian Cutler Group and is deposited across southeastern Utah, northwestern New Mexico, and northeastern Arizona. This formation notably outcrops around Canyonlands National Park, Natural Bridges National Monument, and Monument Valley. The age of the Organ Rock is constrained to the latter half of the Cisuralian Epoch by age dates from overlying and underlying formations. Important early terrestrial vertebrate fossils have been recovered from this formation in northern Arizona, southern Utah, and northern New Mexico. These include the iconic Permian terrestrial
Cliffs of Magho Cliffs of Magho The Cliffs of Magho are a limestone escarpment located in the townland of Magho, County Fermanagh, Northern Ireland. The NNW-facing cliffs overlook the western reaches of Lower Lough Erne and define the northern edge of Lough Navar Forest, a major plantation managed by the Forest Service of Northern Ireland. A popular viewpoint atop the cliffs is accessed by a forest drive. The escarpment is formed from two distinct bands of Carboniferous limestone: the Glencar Limestone Formation and the overlying Dartry Limestone Formation. These overlie a series of mudrocks known as the Benbulben Shale Formation. Under the cliffs