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
USS Brazos (AO-4) USS Brazos (AO-4) USS "Brazos" (AO-4) was an "Kanawha"-class fleet oiler built during World War I for service in the United States Navy, and named for the Brazos River, the longest river in the State of Texas. "Brazos" was laid down at the Boston Navy Yard; launched 1 May 1919; sponsored by Miss Catherine Rush; and commissioned 1 October 1919, Commander R. Werner, USNRF in command. As a tanker attached to the Train, Scouting Fleet, "Brazos" carried fuel oil and stores along the east coast of the United States and in the Caribbean. In 1922 she served temporarily with the