A new series of radiocarbon measurements from Japan’s Lake Suigetsu should help make radiocarbon dating more precise and accurate, especially for older objects, researchers report.

The work could be used to refine estimates of the ages of organic material by hundreds of years. Archaeologists, for example, may be able to further specify the timing of the extinction of Neandertals or the spread of modern humans into Europe. And climate scientists may better understand the chains of events that led to the advance and retreat of the ice sheets during the last glacial period.

New findings from the Paisley Caves in Oregon suggest that a stone tool technology known as Western Stemmed projectile points overlapped with—rather than followed—the technology of the Clovis culture.

The Clovis culture, defined by its distinctive broad, fluted projectile points, is believed to have arrived in North American about 13,500 years ago. Many researchers had believed that Western Stemmed projectile points evolved directly from Clovis technology.