ang2pang asked
The network of 170 cactus-ringed lagoons around the town of Cuatro Cienegas have intrigued evolutionary biologists for decades because their fish, snail and turtle species rival the Galapagos Islands in their uniqueness. Scientists from NASA’s Astrobiology Institute have begun studying the lakes’ ancient formations called stromatolites — rock structures formed by layers of algae that trap silt. Conditions within the stromatolites are similar to those that prevailed on Earth for more than 2 billion years before the dinosaurs evolved.
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