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Fossil Stromatolite From Wyoming. Image Shows A Fossil Stromatolite Collected From The Big Horn Mountains Of Wyoming. Stromatolites Were Formed By Blue-Green Algae Under Shallow, Tidal Waters Where Laminated Domes Formed By Grains Of Sediment Being Trapped On The Algae’S Sticky Surface. Stromatolites Produced And Released Oxygen Which Became An Abundant Gas In Our Atmosphere For The First Time. . This Species (Codonophycus Austinii) Was Found In The Mississippian Period (Madison Limestone) Making It About 325-347 Million Years Old.