From Ohio History Central
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| caption = Postcard view of Inscription Rock, on the shoreline of Kelly's Island, Erie County, Ohio, ca. 1915-1935.
<p>Inscription Rock is located in Erie County on Kelleys Island. It is one of Ohio's most famous rock art sites. Pre-contact groups of North American Indian
poples engraved more than one hundred designs onto a huge limestone boulder on the south shore of the island. The symbols are called "petroglyphs" from the Greek words for rock writing.</p>
<p>There was once another boulder with petroglyphs along the north shore of Kelleys Island, but workers quarrying the limestone blasted it apart with dynamite in the mid-nineteenth century.</p>
<p>The precise age of these carvings is unknown. Based on the symbolism and the amount of weathering of the generally soft limestone, they probably are less than one thousand years old and so likely are the work of the the so-called "Late Prehistoric" period Sandusky culture, or the work of American Indian peoples living in the region during the period of European colonization.</p>