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There are many fossil examples on this rock. The one featured here is coral, There is also what is most likely a part of a crinoid (see spotting http://www.projectnoah.org/spottings/157...). This rock contained several other fossil examples of the brachipod variety as well (see spotting http://www.projectnoah.org/spottings/162...). The rock measures ~40 mm (1.6 in) long, ~12.5 mm (.50 in) wide and ~12.6 mm (.49 in) thick. These fossils date to the Devonian Period (416-359.2 million years ago).
Rocky brook (stream) bed. Gully Brook, Willoughby, Ohio, USA.
The close up pictures were taken with a Digital Blue QX5 USB Microscope at 10x power.