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
Smith Rock State Park Smith Rock State Park Smith Rock State Park is an American state park located in central Oregon's High Desert near the communities of Redmond and Terrebonne. Its sheer cliffs of tuff and basalt are ideal for rock climbing of all difficulty levels. Smith Rock is generally considered the birthplace of modern American sport climbing, and is host to cutting-edge climbing routes. It is popular for sport climbing, traditional climbing, multi-pitch climbing, and bouldering. The geology of Smith Rocks is volcanic. It is made up of layers of recent basalt flows overlaying older Clarno ash and tuff formations. Approximately 30 million