Crinoid Fossil Plate - 3.430" Cutwordco a period where cyanobacteria photosynthesized

a period where cyanobacteria photosynthesized massive amounts of free oxygen

as assembled hundreds of years ago by medieval craft workers

a system of large lakes covered hundreds of square miles across the modern-day intersection of Utah

they can crawl across the sea floor using their flexible arms

Indiana University Press

Crinoid Fossil Plate - 3.430" Cutwordco a period where cyanobacteria photosynthesizedCrinoids are an incredible group of aquatic animals that attach themselves to the seafloor and filter feeds with beautiful feathered arms. These creatures are echinoids, an ancient and varied group of life. Crinoids emerged in the fossil record over 541,000,000 years ago and some species still exist to this day. This specimen is a 3. 430" crinoid fossil plate that dates to about 323,000,000 to 331,000,000 years old. It comes from the Bangor Limestone