Help Us Guide You Better
best online ias coaching in india

Download Pdf



The team carefully sampling the different cultural layers in the cave.   | Photo Credit: Devlin A. Gandy/ www.joh.cam.ac.uk

Stone tools unearthed in a cave in central Mexico and other evidence from 42 far-flung archeological sites indicate people arrived in North America earlier than previously known, upwards of 30,000 years ago.

Scientists said on Wednesday they had found 1,930 limestone tools, including small flakes and fine blades that may have been used for cutting meat and small points that may have been used as spear tips, indicating human presence at the Chiquihuite Cave in a mountainous region of Mexico's Zacatecas state.

The tools spanned from 31,000 to 12,500 years old, said archaeologist Ciprian Ardelean of Universidad Autūnoma de Zacatecas in Mexico, lead author of one of two studies published in the journal Nature. The site was occupied periodically for millennia by nomadic hunter-gatherers.

In the second study, evidence from 42 sites around North America and the location of a land bridge that connected Siberia to Alaska during the last Ice Age indicated human presence dating to at least a time called the Last Glacial Maximum, when ice sheets blanketed much of the continent, about 26,000 to 19,000 years ago and immediately thereafter.

The research also implicated humans in the extinctions of many large Ice Age mammals such as mammoths and camels.

Our species first appeared about 3,00,000 years ago in Africa, later spreading worldwide. The new findings contradict the conventional view that the first people arrived in the Americas around 13,000 years ago, crossing the land bridge, and were associated with the “Clovis culture,” known for distinctive stone tools.

The findings suggest low numbers of people entered the continent earlier than previously understood — some perhaps by boat along a Pacific coastal route rather than crossing the land bridge — and some died out without leaving descendants.

Archaeological scientist Lorena Becerra-Valdivia of the University of Oxford in England and the University of New South Wales in Australia said the continent's populations then expanded significantly beginning around 14,700 years ago. “The peopling of America was a complicated, complex and diverse process,” Ardelean said. “These are paradigm-shifting results that shape our understanding of the initial dispersal of modern humans into the Americas.”

You have reached your limit for free articles this month.

To get full access, please subscribe.

Already have an account ? Sign in

Start your 14 days trial now. Sign Up

Find mobile-friendly version of articles from the day's newspaper in one easy-to-read list.

Move smoothly between articles as our pages load instantly.

Enjoy reading as many articles as you wish without any limitations.

A one-stop-shop for seeing the latest updates, and managing your preferences.

A select list of articles that match your interests and tastes.

We brief you on the latest and most important developments, three times a day.

*Our Digital Subscription plans do not currently include the e-paper ,crossword, iPhone, iPad mobile applications and print. Our plans enhance your reading experience.

Dear reader,

We have been keeping you up-to-date with information on the developments in India and the world that have a bearing on our health and wellbeing, our lives and livelihoods, during these difficult times. To enable wide dissemination of news that is in public interest, we have increased the number of articles that can be read free, and extended free trial periods. However, we have a request for those who can afford to subscribe: please do. As we fight disinformation and misinformation, and keep apace with the happenings, we need to commit greater resources to news gathering operations. We promise to deliver quality journalism that stays away from vested interest and political propaganda.

Dear subscriber,

Thank you!

Your support for our journalism is invaluable. It’s a support for truth and fairness in journalism. It has helped us keep apace with events and happenings.

The Hindu has always stood for journalism that is in the public interest. At this difficult time, it becomes even more important that we have access to information that has a bearing on our health and well-being, our lives, and livelihoods. As a subscriber, you are not only a beneficiary of our work but also its enabler.

We also reiterate here the promise that our team of reporters, copy editors, fact-checkers, designers, and photographers will deliver quality journalism that stays away from vested interest and political propaganda.

Suresh Nambath

Please enter a valid email address.

Subscribe to The Hindu now and get unlimited access.

Already have an account? Sign In

Start your 14 days trial now Sign Up

You can support quality journalism by turning off ad blocker or purchase a subscription for unlimited access to The Hindu.

© Zuccess App by crackIAS.com