Pleistocene climate variability in eastern Africa influenced hominin evolution

Area of Science:

• Paleoclimatology
• Paleoanthropology
• African environmental history

Background:

• Limited continuous paleoenvironmental records hinder understanding of hominin evolution in East Africa.
• Eastern Africa is a key region for early human populations and fossil discoveries.

Purpose of the Study:

• To establish a 620,000-year environmental record from Chew Bahir, southern Ethiopia.
• To investigate the influence of climatic variability on hominin evolution and dispersal.

Main Methods:

• Analysis of a 620,000-year environmental record from Chew Bahir, Ethiopia.
• Correlation of climatic data with hominin fossil and archaeological evidence.

Main Results:

• Stable humid conditions (~620,000-275,000 years BP) coincided with high hominin anatomical diversity.
• Climatic cyclicity (~275,000-60,000 years BP) influenced technological transitions and the emergence of Homo sapiens.
• Synchronized humid pulses facilitated Homo sapiens dispersal (~60,000-10,000 years BP).

Conclusions:

• Environmental changes significantly impacted hominin biological and cultural evolution.
• Paleoclimate data provides crucial context for understanding human origins and migrations.
• The Chew Bahir record offers insights into the interplay between climate and hominin development over 620,000 years.