After Mexican independence (c. 1810–1836), the region remained largely undeveloped. One of the earliest European naturalists to survey Texas was Jean Louis Berlandier (1803–1851), a French naturalist who participated in a Mexican Boundary Survey from 1828 to 1829. Although Berlandier did not survey the Big Thicket area, he did travel to Robbins Crossing, where the El Camino Real (Old San Antonio Road) crossed the Trinity River and camped May 25–29, 1829, collecting information on the Trinity River among other things. Of the lower Trinity, Berlandier wrote in his journal "Every year in May or June the water overflows its banks. These banks are covered with dense forest where one finds many nut trees oaks, maples, elms, and pines. The banks are populated by various Indian nations of the United States of America, such as the Conchates [Coushatta, Kichais, and Kicapoos, who have established their village there. One also finds two villages of colonist, known as Trinidad and Atascosito, which have achieved some growth at the present time". Lorenzo de Zavala (1788–1836) received empresario land grants in 1829 and sought to interest capitalists in New York without success. In 1830, Zavala formed the Galveston Bay and Texas Land Company in New York City with Joseph Vehlein and David G. Burnet (holding grants for in Texas) in hopes of colonizing the land, but they had minimal success. Stephen Jackson received in Hardin County, settling at Sour Lake Springs around 1835, the oldest extant town in the county. With Texas independence (1836), and the early years of statehood in the United States, Anglo-Saxon settlers began drifting into the area. Entrepreneurs bottled the water from the Sour Lake Springs and Jackson had developed a health resort with quality accommodations there by 1850. A Sour Lake post office was established in 1866 but discontinued in 1876. In the mid-nineteenth century the Big Thicket was sparsely populated by a few scattered inhabitants living in the woods off subsistence farming, hunting, and running free range hogs and cattle. It also had a reputation as a place for those avoiding conscription in the Confederate Army, Jayhawkers, outlaws, and such.