BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Brachiopod fossil (Unispirifer sp.). Unispirifer had a worldwide distribution during the Carboniferous Period, and grew to a width of about 120 mm. It was an articulate brachiopod with a wide, straight hinge and ribbed, convex valves. In this photo, the larger pedicle valve can be seen behind the brachial valve.
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