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
Black Rock Mountain State Park Black Rock Mountain State Park Black Rock Mountain State Park is a Georgia state park west of Mountain City in Rabun County, Georgia, in Georgia's Blue Ridge Mountains. It is named after its sheer cliffs of dark-colored biotite gneiss. Astride the Eastern Continental Divide at an elevation of , the park provides many scenic overlooks and vistas of the southern Appalachian Mountains. On a clear day, four states are visible: Georgia, North Carolina, South Carolina, and Tennessee. In addition to Black Rock Mountain itself, the park includes four other peaks over in elevation, making it the highest state park in