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
Trinity and Brazos Valley Railroad Depot and Office Building NRHP nomination, "Its design and durability indicate the confidence with which the new company began its operations and the importance which the railroad company once placed on it s passenger business." The depot served passengers from 1907 until passenger service was discontinued in 1966. The railroad's offices moved away in 1968 and the depot was sold to the city of Teague in 1979. It became the Burlington and Rock Island Railroad museum in 1970. It is also a Texas State Antiquities Landmark. Trinity and Brazos Valley Railroad Depot and Office Building The Trinity and Brazos Valley Railroad Depot and Office