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HomeScienceDiscovery of stone tools challenges entire theory of human evolution

Discovery of stone tools challenges entire theory of human evolution

Recent discoveries of stone tools are prompting a reassessment of the cultural evolution of Homo sapiens during its expansion through Eurasia between 50,000 and 40,000 years ago.

This research, based on a study led by the Nagoya University Museum in Japan, challenges the prevailing view of a rapid cultural and technological “revolution” that allowed modern humans to surpass Neanderthals and other archaic human species.

Rather, it suggests a more complex and gradual process of cultural evolution.

Cultural tapestry: Between the Middle and Upper Paleolithic

The study focuses on the cultural transition of the Middle-Upper Paleolithic (MP-UP), outlining an important juncture between two fundamental evolutionary phases.

During the Middle Paleolithic, spanning from 250,000 to 40,000 years ago, anatomically modern humans coexisted with Neanderthals, sharing similar stone tool technologies.

This period was characterized by the use of “Levallois methods”, a technique that involved making tools by striking stones with a hammer-like tool.

The transition to the Upper Paleolithic era, between 50,000 and 12,000 years ago, marked a significant evolutionary leap.

This era witnessed the extensive geographical expansion of modern humans and the extinction of archaic human species.

It was also a time of cultural flourishing, evidenced by advances in tool technology, food acquisition strategies, navigation, and the emergence of artistic expressions through ornaments and rock art.

The traditional academic position posited the MP-UP transition as a sudden change, driven by revolutionary cultural advances, including a speculated neural mutation in Homo sapiens that boosted cognitive abilities.

This jump was thought to have given them a definitive advantage over other species, leading to the demise of the Neanderthals.

However, the Nagoya University team’s research paints a different picture.

They analyzed the efficiency of stone tools along a 50,000-year timeline that covered six cultural phases from the Late Middle Paleolithic to the Upper Paleolithic and the Epipaleolithic period.

Their analysis found that the significant jump in toolmaking productivity did not occur at the beginning of the Homo sapiens‘ dispersal in Eurasia.

Instead, it took place later, along with the development of sheet technology in the early Upper Paleolithic.

This discovery indicates that cultural evolution from the Middle to Upper Paleolithic was not marked by a single, abrupt revolution, but rather was a complex, multi-stage process.

Professor Seiji Kadowaki, lead researcher, emphasizes the nuanced nature of this transition.

He said: “In terms of cutting-edge productivity, Homo sapiens did not begin to spread to Eurasia after a rapid revolution in stone tool technology, but innovation in ‘cutting-edge’ productivity came later, along with miniaturization. of stone tools such as blades.”

A deeper understanding of our ancestors.

In summary, this study reveals a nuanced view of Homo sapiens‘Cultural evolution during its Eurasian expansion between 50,000 and 40,000 years ago.

Contrary to the conventional belief that a rapid technological revolution would allow modern humans to dominate Neanderthals and other archaic species, the study suggests a more gradual and complex process.

By analyzing the productivity of stone tools over thousands of years, researchers question the notion of abrupt cultural change and propose instead a multi-stage evolution characterized by later innovations in tool making.

The team’s research challenges previous assumptions and enriches our understanding of human evolution. It portrays a journey of adaptation and innovation, reminding us of the intricate process that has shaped the course of human history.

Through the lens of stone tool technology, we gain a deeper appreciation of the resilience and ingenuity of Homo sapiens.

As mentioned above, the evolution of stone tools marks a fascinating journey through human prehistory, reflecting the growth of human intellect, adaptability, and survival skills.

This journey begins over 3.3 million years ago, with the first known stone tools, identified as the Oldowan toolkit.

Made by our hominid ancestors, these simple tools consisted of roughly hewn rocks that were used for cutting, crushing, and scraping.

The innovation of Oldowan tools represented a monumental leap in human evolutionary history, showing the ability to manipulate the environment to survive.

Acheulean hand ax

As time passed, around 1.76 million years ago, a significant advance occurred with the appearance of the Acheulean hand axe.

This marked a leap in technological sophistication. Early humans, particularly Homo erectus, began shaping symmetrical tools, demonstrating an understanding of form and function.

These bifacial tools were not only more efficient but also indicative of cognitive advances in early humans, as they required planning and skill to produce.

Mousterian tool culture

The Middle Paleolithic, approximately 300,000 years ago, introduced the Mousterian tool culture, associated with Neanderthals and early Homo sapiens.

This era saw the development of more specialized tools, including the Levallois technique, which allowed for the production of flatter, more controlled scales.

This period underscored a shift toward tools designed for specific tasks, highlighting a more sophisticated understanding of materials and their potential uses.

Evolution of Upper Paleolithic stone tools

A further evolution of stone tools occurred in the Upper Paleolithic, about 50,000 years ago, with the advent of the Aurignacian culture, closely associated with the modern one. Homo sapiens.

This period was characterized by an explosion of creativity and innovation, including the production of bladed tools.

These tools were longer, thinner, and could be further modified into a variety of specialized instruments, such as needles and harpoons.

This era also saw the rise of art and symbolic objects, suggesting a complex social structure and cognitive abilities.

Mesolithic microliths

The Mesolithic period, which began about 10,000 years ago, introduced microliths: small, rolled stone tools that were often used as composite parts of larger tools, such as arrows and sickles.

This innovation was instrumental in the development of more efficient hunting strategies and agricultural practices, laying the foundation for the Neolithic Revolution and the dawn of sedentary agricultural societies.

In short, the evolution of stone tools is a mirror that reflects the evolution of human thought, culture and society.

From the simplest stone flakes to the most sophisticated bladed tools, each advance in tool-making technology reveals insights into the cognitive abilities, social structures, and environmental adaptations of our ancestors.

This evolutionary saga underscores the ingenuity and resilience of humans in their relentless quest for survival and progress.

The full study was published in the journal Nature Communications.


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