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Fossils are generally found in sedimentary rock — not igneous rock.

Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years.

They all start with similar flaws, but Carbon-14 has more than the rest.

The Carbon-14 “dating” method was introduced by Dr. Libby (1908-1980) at the University of Chicago in 1949. Carbon-12 is the normal stable isotope of Carbon (99% of all Carbon), which is the basic building block of organic life forms.

This is the first time that it has been demonstrated that another species of hominin survived alongside the first humans in Africa.

The research, published today in three papers in the journal e Life, presents the long-awaited age of the naledi fossils from the Dinaledi Chamber and announces the new discovery of a second chamber in the Rising Star cave system, containing additional specimens of Homo naledi.

Homo naledi, which was first announced in September 2015, was alive sometime between 335 and 236 thousand years ago.

This places this population of primitive small-brained hominins at a time and place that it is likely they lived alongside Homo sapiens.

Other critics, perhaps more familiar with the data, question certain aspects of the quality of the fossil record and of its dating.

These include a child and a partial skeleton of an adult male with a remarkably well-preserved skull.

The new discovery and research was done by a large team of researchers from the University of the Witwatersrand (Wits), James Cook University, Australia, the University of Wisconsin, Madison, United States, and more than 30 additional international institutions have today announced two major discoveries related to the fossil hominin species Homo naledi.

The team was led by Professor Lee Berger of The University of the Witwatersrand in Johannesburg, South Africa, and a National Geographic Explorer in Residence.

The discovery of the second chamber with abundant Homo naledi fossils includes one of the most complete skeletons of a hominin ever discovered, as well as the remains of at least one child and another adult.

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