Washington(AP): Fossilised footprints discovered in New Mexico indicate that early humans were walking across North America around 23,000 years ago, researchers reported Thursday.
The footprints were found in a dry lake bed in White Sands National Park, first spotted in 2009 by a park manager. Scientists at the US Geological Survey recently analysed seeds stuck in the footprints to determine their approximate age, ranging from around 22,800 and 21,130 years ago.
Most scientists believe ancient migration came by way of a now-submerged land bridge that connected Asia to Alaska. Based on various evidence including stone tools, fossil bones and genetic analysis other researchers have offered a range of possible dates for human arrival in the Americas, from 13,000 to 26,000 years ago or more.
The current study provides a more solid baseline for when humans definitely were in North America, although they could have arrived even earlier, the authors say. Fossil footprints are more indisputable and direct evidence than cultural artifacts, modified bones, or other more conventional fossils, they wrote.
What we present here is evidence of a firm time and location, they said.
Based on the size of the footprints, researchers believe that at least some were made by children and teenagers who lived during the last ice age.
The research was published Thursday in the journal Science.
Earlier excavations in White Sands National Park have uncovered fossilized tracks left by a saber-toothed cat, dire wolf, Columbian mammoth and other ice age animals.
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Gorakhpur (UP)(PTI) Police on Tuesday arrested four persons and detained a boy in connection with the killing of a teenager at a school here, officials said.
The arrested accused have been identified as Dayanand alias Chhotu, Hrithik Roshan alias Roshan, Uday alias Kishan Kumar and Deepak, all residents of Pipraich police station area here and aged 19-20, the police officials said.
The detained minor will be produced before the Juvenile Justice Board, they said.
Police recovered a country-made pistol and a motorcycle allegedly used by the accused in the commission of the crime, they added.
Superintendent of Police (North) Gyanendra Nath Prasad said the arrests were made following sustained investigation and technical surveillance, and further legal proceedings were underway.
According to police, Sudhir Bharti (17), a class 11 student, was shot dead by the accused on December 26 over old enmity and a dispute triggered by social media posts in the playground of a school in the Pipraich area here.
Based on the complaint filed by Bharti's family, a case was registered under sections 103(1) (punishment for murder) and 61(2) (party to a criminal conspiracy) of the Bharatiya Nyaya Sanhita and relevant provisions of the Arms Act.
According to eyewitnesses, Bharti was in the playground when he had an argument with a person from the same neighbourhood.
The argument escalated and the accused shot him with a country-made pistol, killing him on the spot, they said.
