Land bridge BERINGIA NORTH AMERICA Est. 12,910 years old Est. 10,560 years old Est. 12,707 years old Est. 10,500 years old As early as 10,000 years ago, Ice Age glaciers melted, flooding the cave system.Passages to the pit are more than 30 feet below sea level. Scientists extracted the upper right third molar, from which they isolated mitichondrial DNA for sequencing. The girl’s genome contained a series of adjacent genes known as subhaplogroup D1, a distinctly Asian configuration that developed in people living in Beringia before they passed from there into the Americas. FRESHWATER Sea level HOYO NEGRO SALTWATER Divers FEET 0 100 A CAVE OF PALEONTOLOGICAL WONDERS THE DNA TRUTH IS IN THE TEETH Remains of Paleoamericanswith recovered DNA The skeleton was found in Hoyo Negro, a Yucatan cave far to the southeast of where other ancient American remains — fromwhich DNA has been analyzed — have been found. Ice extent12,000and20,000years ago Coastline20,000years ago The DNA tooth Fractures in the girl’s pubic bones suggest that she fell into a shallow pool from an upper cave passage. Her final resting place was in the 200-foot-diameter domed pit of Hoyo Negro, hundreds of feet from the nearest cave entrance. 2 gomphotheres (Cuvieronius) 2 Shasta ground sloths(Nothrotheriops shastensis) Human(Homo sapiens) 1 white-nosedcoati(Nasua narica) 2 bobcats(Lynx rufus) 2 saber-toothed cats(Smilodon fatalis) 2 peccaries(Pecari tajacu) 2 coyotes(Canis latrans) 6 tremarctine bears(Tremarctos) 2 tapirs(Tapirus) 3 cougars(Puma concolor) 1 sloth(Megalonychidae) Along with her skeleton are the remains of at least 26 large mammals, many of which are now extinct. HER MAMMALIAN COMPANIONS

SOURCE: "Late Pleistocene Human Skeleton and mtDNA Link Paleoamericans and Modern Native Americans," Science.