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Related Experiment Videos

Earliest Homo.

A Hill1, S Ward, A Deino

  • 1Department of Anthropology, Yale University, New Haven, Connecticut 06520.

Nature
|February 20, 1992
PubMed
Summary
This summary is machine-generated.

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The earliest fossil of the Homo genus, dating back 2.4 million years, has been identified in Kenya. This discovery provides crucial evidence for the early evolution of Homo and its potential link to early stone tool use.

Area of Science:

  • Paleoanthropology
  • Geochronology
  • Human Evolution

Background:

  • The origin of the genus Homo is linked to climatic cooling around 2.4 million years ago.
  • Early Homo is associated with the first stone tools, dated between 2.6-2.4 million years ago.
  • Fossil evidence of Homo predating 1.9 million years ago has been scarce.

Purpose of the Study:

  • To determine the age of the KNM-BC1 fossil specimen.
  • To taxonomically assign the KNM-BC1 fossil to the genus Homo.
  • To establish the earliest securely dated fossil of the genus Homo.

Main Methods:

  • Argon-argon (40Ar/39Ar) dating of hominid-bearing site materials.
  • Comparative morphological analysis of the KNM-BC1 fossil with other hominid specimens.

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Main Results:

  • 40Ar/39Ar dating of the hominid site yielded an age of 2.4 million years.
  • Comparative studies enabled the assignment of KNM-BC1 to the genus Homo.
  • KNM-BC1 represents the earliest securely identified fossil of the genus Homo.

Conclusions:

  • The KNM-BC1 fossil, dated to 2.4 million years ago, is the oldest known specimen of the genus Homo.
  • This finding supports the correlation between the origin of Homo and climatic cooling events.
  • The discovery has significant implications for understanding early human evolution and behavior.