Really big cellsThis slab of rock is 3.9 centimeters across. Every single critter you see preserved

Really big cellsThis slab of rock is 3.9 centimeters across. Every single critter you see preserved is…remarkably, a single cell. These are a unique type of foraminifera called fusulinids.Foraminifera are single-celled, ocean-dwelling organisms that make hard shells out of calcium carbonate. Fusulinids developed as a normal-sized type of foram during the Mississippian, around 320 million years ago, but they rapidly expanded. By the time this rock formed in the Pennsylvanian, fusulinids had grown to the point where a single cell could be over a centimeter long. Eventually they reached a point where a single cell could be over 5 centimeters long.This unit, Kansas’s Lola formation, is one of several units in the United States filled with these spectacular fossils. Fusilinids died out during the end-Permian mass extinction.-JBBImage credit: https://flic.kr/p/pppbiiRead more: http://www.kgs.ku.edu/Extension/fossils/fusulinid.html -- source link

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