Collenia is genus of fossil cyanobacteria that form a particular type of stromatolites.
Collenia is genus of fossil cyanobacteria that form a particular type of stromatolites.
==Description== Collenia are stromatolites made up of convex layers flattened in the center, forming columnar colonies. The microorganisms involved were likely photosynthetic bacteria expiring oxygen.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).