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Dating hominids

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(Toumaï) (1, 2) have changed substantially the understanding of early human evolution in Africa (1–4).

The sedimentary unit from which Toumaï was unearthed was named the anthracotheriid unit (A. also contains a mammalian fauna that includes taxa that are more primitive than the Lukeino fauna [Kenya, dating from 6 Ma ago (6)] and similar to the fauna from the lower Nawata Formation of Lothagam [Kenya, 6.5–7.4 Ma ago (7)].

These dates indicate that anatomically modern man occurs sympatrically and possibly even predates the Rhodesian group of Neandertals in Africa.

Modern man might also be contemporary to and possibly even predate the occurrence of Neandertal in Europe.

In the past two decades, particularly, discoveries of our fossil ancestors have been made in unprecedented numbers and diversity.

Two possibilities for the evolution of modern man are suggested. Irrespective of either one of these possibilities, modern man evolved in Africa and seems to have migrated into Europe and other parts of the world.

We also demonstrate, by trace element analysis, that the composition of the calcite encrustation is the same as that of the very top of the travertine floor.

During the latter half of this century anthropological surveys in East Africa have made significant contributions to understanding how the human species has evolved.

The age of the skull, which was apparently encrusted by brown calcite soon after the death of the individual concerned, has been variously estimated at between 70,000 yr.

Here we show using electron spin resonance (ESR) measurements of the calcite encrustation and of bone fragments that the age of the Petralona hominid lies between 160,000 and 240,000 yr.