The Old Spanish Trail became a commercial trail network linking New Mexico and California after Mexican trader Antonio Armijo led the first successful commercial caravan in 1829 across the remote deserts and mountains of Mexico's far northern frontier, carrying New Mexico serapes and other woolen goods to Los Angeles and bringing California-bred horses and mules back to Santa Fe. Built from indigenous footpaths and earlier trade and exploration routes, the network included the Armijo Route, the Northern Route first blazed by William Wolfskill and George C. Yount in 1831, the North Branch, and the Mojave Road, with all routes joining east of present-day Barstow, crossing Cajon Pass, and continuing to San Gabriel Mission and Los Angeles. In 1844 John C. Fremont followed the trail from California as far as Parowan Valley before leaving it, and his maps and diaries of its western section helped guide Mormon settlers, who developed it into a wagon-passable road to Los Angeles by 1847. Orville Pratt's 1848 account recorded the severe descent of Little Creek and then the sudden sight of Parowan Valley as one of the finest and most extensive valleys he had seen in the western country. In Iron County, Spanish explorers traveled nearly 100 miles along routes now followed by major highways, and Enoch later became a major trading post along the Northern Route in the mid-1800s.