Sandstone rocks. Rio Mimbres. 1850. From Rice University http://hdl.handle.net/1911/35676.
Image taken from larger work: "Personal narrative of explorations & incidents in Texas, New Mexico, California, Sonora and Chihuahua, volume 1: Connected with the United States and Mexican boundary commission, during the years 1850, '51, '52, and '53" http://hdl.handle.net/1911/27060