Mata Menge, however, produced a small number of stone tools, including some made of nonlocal chert, as well as remains of large stegodon, crocodile, giant rat, freshwater molluscs, and plants... Morwood dated the sites using a technique that analyzes individual zircon crystals from volcanic deposits. A sample from Tangi Talo, taken near a pygmy stegodon tusk and giant tortoise shell fragments, yielded a date of about 900,000 years ago. At Mata Menge, a sample from just beneath the artifact-bearing level dated to about 880,000 years ago, while another, taken above in situ artifacts, gave a date of about 800,000... Tools...