RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Kosmoceras ammonite. Artwork of a Kosmocerus ammonite, showing this marine invertebrate emerging from its shell. Ammonites were marine molluscs that formed a spiral shell to protect their soft body. This species is from the Middle Jurassic Period to Early Cretaceous Period (176 to 100 million years ago).
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