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
Brazos Bend State Park Brazos Bend State Park Brazos Bend State Park is a state park along the Brazos River in Needville, Texas, run by the Texas Parks and Wildlife Department. The park is a haven for a diverse mix of native wildlife and plants covering an equally diverse range of ecosystems. Brazos Bend contains areas of coastal prairie, bottomland forest, and a wide range of wetlands including open and semi-open lakes and transitional marshlands. Highlights of the Park's numerous inhabitants include over 300 species of resident and visiting migratory birds and mammals such as the white-tailed deer, nine-banded armadillo, raccoon, and North American