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
Acadia Cliffs State Nature Preserve Acadia Cliffs State Nature Preserve Acadia Cliffs State Nature Preserve is a state nature preserve in Washington County, Ohio, United States, with a small neck extending into Athens County, Ohio. Covering an area of , it was founded in 1994. It is known for its sandstone cliffs. For a time, it was administered by the Ohio State Division of Wildlife, but is now administered by the Ohio Division of Nature Preserves. The nature preserve is close to the Washington-Athens County border. The preserve centers on Beebe Road, which may be reached from Ohio State Route 144 east of Stewart, Ohio.