150-million-year-old shark fossil in Germany defies classification. Bavariscyllium fossil reveals unique features and sensory organs. Study suggests shark evolution is more complex than once believed.
Most shark fossils are just teeth—their cartilage skeletons usually decay long before they can fossilize. But in northwestern Arkansas, a series of geological sites known as the Fayetteville Shale has ...
Long before highways cut across the Ozarks and rice fields spread across the Delta, the ground beneath Arkansas was part of a vast ocean floor. At different moments in deep time, that seafloor hosted ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results