The earliest inhabitants of the New World came across the Bering Sea land bridge that opened as a result of glaciation, which lowered the level of the sea and connected the continents of Asia and America. The question of when these people walked from Siberia is still debated by archaeologists. In 1932, a site excavated near Clovis, New Mexico, yielded the bones of extinct animals in association with man-made, skillfully fluted stone points. With the development of radiocarbon dating in the late 1940s, it was determined that "Clovis man" had lived between 12,000 and 11,000 years ago. Finely flaked Clovis stone tools have been discovered throughout North America, suggesting an extraordinarily rapid spread - either of ideas and technology, or of people. Presumably Clovis men and women moved across the land, hunting large animals (mammoth, bison, saber-toothed tiger) with stone points hafted to spears, and collecting wild fruits, thistle leaves, yucca pods, roots, and nuts.