RM
Forest marble formation, illustration
Illustration of a scene showing the seafloor during the late Bathonian stage of the Middle Jurassic. The seafloor is shown carpeted with two types of crinoids (sea feathers): the taller stalked crinoids (Isocrinus sp.) and the stalk-less comatulid crinoids (Eocomatula sp.). Eocomatula crinoids were able to swim, as shown in this image. Also on the seafloor are some brachiopod shells and a spiny sea urchin (Acrosalenia sp.)., by RICHARD BIZLEY/SCIENCE PHOTO LIBRARY
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