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Physical sciences/Earth sciences/Geology/Physical geology/Geomorphology/Landforms/Land bridges

The annual natural census is celebrating its 10th anniversary and the National Park Service's 100th by holding hundreds of events at parks nationwide.

Researchers in Texas have discovered thousands of human artifacts in a layer of earth that lies directly beneath an assemblage of Clovis relics, expanding evidence that other cultures preceded the Clovis culture in North America. This pre-Clovis toolkit appears to be between 13,200 and 15,500 years old and it includes biface and blade technology that may have later been adapted—and improved upon—by the Clovis culture.

Scientists have discovered the cremated skeleton of a Paleoindian child in the remains of an 11,500-year-old house in central Alaska. The findings reveal a slice of domestic life that has been missing from the record of the region’s early people, who were among the first to colonize the Americas.

The discovery, by Ben Potter of the University of Alaska Fairbanks and colleagues, appears in the 25 February issue of the journal Science.