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This image shows the dorsal view of Fuxianhuia protensa. The three-inch-long fossil was found in sediments dating from the Cambrian Period 520 million years ago in what today is the Yunnan province in China. Parts of the gut are visible as dark stains alo (Photo: Xiaoya Ma) This image shows the dorsal view of Fuxianhuia protensa. The three-inch-long fossil was found in sediments dating from the Cambrian Period 520 million years ago in what today is the Yunnan province in China. Parts of the gut are visible as dark stains along the animal's midline.