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[]: 18
[Name]: Hueston Woods
[Image]:
[Date]: 1967
[Location]: 39°34′21″N 84°44′29″W / 39.5725°N 84.741389°W / 39.5725; -84.741389 (Hueston Woods)
[County]: Butler, Preble
[Ownership]: state
[Description]: A noteworthy example of beech-maple climax forest that has never been cut. Located in Hueston Woods State Park. -
[]: 22
[Name]: Tinker's Creek Gorge
[Image]:
[Date]: 1967
[Location]: 41°21′54″N 81°36′35″W / 41.365°N 81.609722°W / 41.365; -81.609722 (Tinker's Creek Gorge)
[County]: Cuyahoga
[Ownership]: municipal
[Description]: Contains a virgin oak-hickory and virgin beech-maple-hemlock forest. -
[]: 7
[Name]: Clifton Gorge
[Image]:
[Date]: 1967
[Location]: 39°47′38″N 83°49′53″W / 39.793903°N 83.831525°W / 39.793903; -83.831525 (Clifton Gorge)
[County]: Greene
[Ownership]: state
[Description]: Exemplary of interglacial and postglacial canyon-cutting into the dolomites of the Niagara Escarpment. Part of Clifton Gorge State Nature Preserve. -
[]: 2
[Name]: Blacklick Woods
[Image]:
[Date]: 1974
[Location]: 39°56′14″N 82°48′28″W / 39.937222°N 82.807778°W / 39.937222; -82.807778 (Blacklick Woods)
[County]: Fairfield
[Ownership]: county
[Description]: An outstanding example of relatively undisturbed, old-growth beech-maple and swamp forest communities -
[]: 15
[Name]: Hazelwood Botanical Preserve
[Image]:
[Date]: 1974
[Location]:
[County]: Hamilton
[Ownership]: state
[Description]: Highly detailed study of the site’s plant ecology was published in 1929. Managed by the University of Cincinnati. -
[]: 21
[Name]: Serpent Mound Cryptoexplosive Structure
[Image]:
[Date]: 1980
[Location]: 39°02′00″N 83°24′00″W / 39.033333°N 83.4°W / 39.033333; -83.4 (Serpent Mound crater)
[County]: Adams, Highland, Pike
[Ownership]: private
[Description]: A structure of undetermined origin exposed by differential erosion.
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