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
Texas Brazos Trail Texas Brazos Trail The Texas Brazos Trail is a non-profit organization which promotes heritage tourism, economic development, and historic preservation. It is one of ten regions which make up the Texas Heritage Trails Program of the Texas Historical Commission. In 1968 Texas hosted the World's fair, known as HemisFair '68, in San Antonio, Texas. In connection with this boost in international attention, the Texas Department of Transportation designated ten 650-mile circular driving regions that encompassed the entire state of Texas. These trails saw little attention after their creation until in the late 1990s when the Texas Historical Commission adopted these