January 10, report. A team of researchers from Japan, Indonesia and Germany has found evidence that suggests Homo erectus arrived on the island of Java approximately , years later than thought. In their paper published in the journal Science , the group describes using two techniques to date the volcanic ash from which the oldest known fossils were unearthed, and what they found. Back in , archaeologist Carl Swisher dated the same fossils to approximately 1. Since that time, the fossil dates have become controversial in the archaeological community.
Intro How did they move? What did they look like? Are they all the same species? When did they live? Lucy and other members of her species, Australopithecus afarensis , lived between 3.
While true, fossils are buried with plenty of clues that allow us to reconstruct their history. In , in Ethiopia's Afar region, our research team discovered a rare fossil jawbone belonging to our genus, Homo. To solve the mystery of when this human ancestor lived on Earth, we looked to nearby volcanic ash layers for answers.
Geochronology is the science of determining the age of rocks , fossils , and sediments using signatures inherent in the rocks themselves. Absolute geochronology can be accomplished through radioactive isotopes , whereas relative geochronology is provided by tools such as palaeomagnetism and stable isotope ratios. By combining multiple geochronological and biostratigraphic indicators the precision of the recovered age can be improved.