Fossil hunters in Ethiopia are excavating a mandible, or lower jaw, of Ardipithecus ramidus. A fairly complete skeleton of this individual, nicknamed Ardi, is 4.4-million-years-old. It lived well before and was much more primitive than the 3.2-million-year-old Lucy skeleton, of the species Australopithecus afarensis. Unveiling the Ardi remains this week, scientists said this was the earliest known skeleton of a potential human ancestor.
How Stone Age farmers spread agriculture across Europe
They moved north and mingled with hunter-gatherers, new genetic research finds
“An analysis of 5,000-year-old genetic material from preserved human remains found in Sweden suggests that people moving from southern to northern Europe spread agriculture across that continent long ago.
In addition to agricultural know-how, the intrepid farmers brought their genes: They interbred with hunter-gatherer communities to create modern humans living in Europe today.”
The compilation of a stratigraphic sequence. In (A) all the superpositional relationships are shown in the section and in the Harris Matrix form. (B) A matrix rendition of a section, which is clarified into a stratigraphic sequence in (C), according to the Law of Stratigraphical Succession.
Principles of archaeological stratigraphy, 1979, Harris E