Browsing Tag
uranium-lead dating
2 posts
Tiny cut marks on animal bone fossils reveal that human ancestors were in Romania 1.95 million years ago
Several fossils with possible cut marks from Grăunceanu, Romania. Briana Pobiner Briana Pobiner, Smithsonian Institution; Sabrina Curran, Ohio…
What To Look For In 4-Billion-Year-Old Rock
Ultra-durable crystals called zircons, found in ancient rocks, preserve chemical clues that date back over 4 billion years—revealing…