The Archaeology of La Calsada: A Rockshelter in the Sierra Madre Oriental, MexicoOn a remote mountainside 2,000 meters above sea level in the northern Sierra Madre Oriental, the rockshelter at La Calsada has yielded basic archaeological data for one of the least understood regions of prehistoric North America, the state of Nuevo Len in northern Mexico. This comprehensive site report, with detailed information on artifacts and stratigraphy, provides baseline data for further explorations in the region and comparisons with other