Grand Canyon cliff collapse reveals footprints made by egg-laying animals 313 MILLION years ago

[السياسي]

A collapse in Grand Canyon National Park sent a boulder falling down the side of a mountain that held the oldest vertebrate tracks. Experts say the two sets were made 313 million years ago.

https://www.dailymail.co.uk/sciencetech/article-8651625/Grand-Canyon-cliff-collapse-reveals-footprints-egg-laying-animals-313-MILLION-years-ago.html?ns_mchannel=rss&ito=1490&ns_campaign=1490 ]قرااء المزيد ..... [/url]