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 trails as their Heritage Trail Program. A largely rural area of the U.S. state of Texas, the 18-county Brazos Trail Region historically was dependent on cotton and the railroad for survival. The region is named for the Brazos River which flows through the area, and is still a vital water source. The area's primary industries are cotton, cattle and sugar cane. The railroads connected the region to the Gulf of Mexico for shipment throughout the United States and Europe. In frontier times many European groups settled in the area including: Norwegians, Germans, Scots, Czech, and the Wends. Many examples of