Deep-Sea Wrinkle Structures Discovered in Morocco Reveal 180-Million-Year-Old Chemosynthetic Microbial Ecosystems

Scientists discover 180-million-year-old 'wrinkle structures' in Morocco, proving chemosynthetic microbes thrived in the deep ocean's total darkness.

By: AXL Media

Published: Mar 9, 2026, 6:19 AM EDT

Source: The information in this article was sourced from Geological Society of America

An Unexpected Discovery in the Central High Atlas Mountains

While trekking through the rugged Dadès Valley in Morocco, Dr. Rowan Martindale of the University of Texas at Austin encountered a geological anomaly that has reshaped the study of ancient microbial life. Amidst the debris of ancient underwater landslides known as turbidites, Martindale identified "wrinkle structures"—distinctive ridges and pits typically formed by microbial communities. What made the find "stunned" the research team was the location: these rocks formed 180 million years ago at depths of at least 180 meters. At such depths, the total absence of sunlight precludes the growth of the photosynthetic algae usually responsible for such patterns.

The Rarity of Biological Preservation in Post-Cambrian Rocks

Wrinkle structures are exceptionally rare in the fossil record younger than 540 million years. Following the "Cambrian Explosion," the rapid diversification of animal life led to increased "bioturbation," where burrowing creatures constantly churned the seafloor, erasing delicate microbial textures. The fact that these 180-million-year-old Moroccan wrinkles survived suggests a unique environmental window where animal activity was limited. By meticulously analyzing the sedimentary layers, Martindale and colleague Stéphane Bodin confirmed that these were not mere physical artifacts of water movement but genuine biological fingerprints preserved against the odds of deep-time erosion.

Evidence for a Chemosynthetic Origin in Total Darkness

To solve the mystery of how life flourished without light, the team turned to chemical analysis and modern deep-sea parallels. Sediments directly beneath the wrinkles showed elevated carbon levels, a hallmark of biological activity. The researchers concluded that the structures were formed by chemosynthetic microbes—organisms that derive energy from chemical reactions, such as the oxidation of sulfur or methane, rather than sunlight. Remotely operated vehicle (ROV) footage from modern deep-sea floors confirms that similar microbial mats exist today in the aphotic zone, providing a contemporary analog for the ancient Moroccan environment.