Look again! Those wrinkly rocks may actually be a fossilized microbial community
In 2016 while hiking on a hillside in Morocco, geologist Rowan Martindale saw something that made her stop in her tracks: a slab of sedimentary rock covered in a wrinkly texture reminiscent of elephant skin.
“I looked at the wrinkles and I was like, ‘These aren’t supposed to be in rocks like this. What the heck is going on?’” said Martindale, an associate professor at The University of Texas at Austin’s Jackson School of Geosciences.
Rock textures hold clues about the geological activity that shaped them. To Martindale, these wrinkles in time were a textbook example of microbial mat fossils. They captured a teeming ...