Before plants or animals existed, this 250,000-ton rock fell in the mud. Here’s how we know


https://www.nationalgeographic.com/science/2020/10/huge-rock-fell-in-the-mud-billion-years-ago-how-we-know/?cmpid=org=ngp::mc=crm-email::src=ngp::cmp=editorial::add=SpecialEdition_Escape_20201104&rid=5DAE86AE0897F2B2819B70CBE95CD107