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 include hiking, fishing, and wildlife viewing. Like in much of the upper Gulf Coast located along the northern vanguard areas of the Central Flyway migratory route, bird watching in Brazos Bend is a popular activity, especially during the migratory seasons. The park offers numerous Scouting programs, an orienteering course and is a popular spot for geocaching. The Texas Parks and Wildlife staff and the Brazos Bend State Park Volunteer Organization put on a variety of education programs on a weekly basis at the Park, and actively conduction outreach efforts in the local area. Popular programs include bird and photography hikes,