Fossil Park is located in an abandoned mine in Sylvania, OH. It is on the west side of Centennial Road in Sylvania, which is just north-west of Toledo.
The direcitons sound a bit long, but they are easy to follow. From the Ohio Turnpike, take exit 59, the Maumee/U.S. 20 exit. Follow signs to U.S. 23/Ann Arbor. Go south on U.S. 20 to Dussel Rd. Turn west onto Dussel Road. Follow that road to U.S. 23. Take U.S. 23 north to Central Ave. Make a right (west) onto McCord Rd. Stay on McCord road for about 1 mile north and turn left (west) onto Sylvania Rd. Follow Sylvania Road for about 2 miles to Centennial Road. Turn right (north) for a little under 2 miles on Centennial Road, and you should see a sign marking the park.
The park is open weekends from Memorial day until October 22nd.
Linked from FossilGuy