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There are two very distinct fossils on this rock. One is a brachiopod (seen on the left in the first photo and on the right in the second photo.). The other is of coral (see spotting http://www.projectnoah.org/spottings/158...). The rock measures ~41 mm (1.6 in) long and ~16 mm (.62 in) wide. The fossil measures ~11.5 mm (.45 in) tall and ~14 mm (.54 in) wide. This fossil dates to the Devonian Period (416-359.2 million years ago).
Rocky brook (stream) bed. Gully Brook, Willoughby, Ohio, USA.
I kicked this rock aside with my foot and noticed the brachiopod fossil staring right up at me. The close up pictures were taken with a Digital Blue QX5 USB Microscope at 10x power.