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
March to the Brazos April Fool’s Day pranks, was becoming a little too regular occurrence for the Commandant. The next year the Commandant issued General Order No. 27 and began what became known as the “Hike to the Brazos” and eventually the “March to the Brazos.” The hike originated in 1909 and was held March 31 through April 1 to keep the cadets from playing April Fool’s jokes on each other and their instructors. This tradition was held annually until 1912 at which point it was discontinued. March to the Brazos was revived in 1977 when cadet leadership saw the natural tie between March