The Paleoindian Period (16,000–8000 BC) came toward the end of the Ice Age, a time when the climate warmed and the largest mammals became extinct. Likely having originally migrated from Asia, the first people in Virginia were hunter-gatherers who left behind lithic, or stone, tools, often spearheads. At thein Sussex County, these date back to 16,000 BC, or well before the better-known Clovis culture. The so-called Paleoamericans likely banded together in groups of thirty to fifty and located themselves near high-quality stone resources, especially in Dinwiddie and Mecklenburg counties. While keeping a base camp, they may have established smaller settlements for more specialized tasks such as tool-making and hunting. The bands probably lacked central leadership, moved often, and traded with one another. Based on the of the later , they likely were animists, investing various natural forces with spiritual power.