The Quaternary period, spanning the last 2.6 million years, represents Earth’s most recent geological era, defined by recurring ice ages and the rise of modern humans. Scholars such as S. Laing highlighted its importance in human evolution, pointing out the diversity of human forms present throughout this time, while Frank W. Blackmar stressed the clear evidence of human activity during the Quaternary’s ice age periods.
Gaston de Saporta emphasized the era’s value in mapping human history through fossil remains, and Ernst Haeckel connected Quaternary humans to the broader continuity of evolution. Meanwhile, the marquis de Nadaillac placed human antiquity within Earth’s extensive geological history. Collectively, these viewpoints present the Quaternary as a crucial framework for understanding human origins and the complex relationship between life and planetary transformation.