Nacimiento Formation Nacimiento Formation The Nacimiento Formation is a sedimentary rock formation found in the San Juan Basin of western New Mexico (United States) and named for the Nacimiento Mountains. It is a heterogeneous nonmarine formation composed of shale, siltstone, and sandstone, deposited in floodplain, fluvial and lacustrine settings, and made up of sediment shed from the San Juan uplift to the north and the Brazos-Sangre de Cristo uplift to the east. It was deposited mostly between ~64.5 and ~61 million years ago, during the early and middle Paleocene. The climate was humid and warm to hot. This unit interbeds with the
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