Of the 282 Chinchorro mummies found thus far, 29% of them were results of the natural mummification process (7020 BC-1300 BCE). In northern Chile, environmental conditions greatly favor natural mummification. The soil is very rich in nitrates which, when combined with other factors such as the aridity of the Atacama Desert, ensure organic preservation. Salts halt bacterial growth; the hot, dry conditions facilitate rapid desiccation, evaporating all bodily fluids of the corpses. Soft tissues, as a result, dry before they decay and a naturally preserved mummy is left. Even though the Chinchorro people did not mummify the bodies artificially, the bodies were still buried wrapped in reeds with grave goods.