9,900-year-old Mexican female skeleton distinct from other early American settlers (image) PLOS Share Print E-Mail Caption Underwater exploration of Chan Hol Cave, near Tulum, Mexico. Credit Photo by Eugenio Acevez. Usage Restrictions CC-BY: Redistribution permitted with credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.