If you live in Ohio and have ever spotted a strangely round, heavy rock in your garden or along a creek bed, one that looks too smooth and too symmetrical to belong there, you are not imagining things. Residents across the state, particularly around Columbus, have been puzzling over these sphere-like formations for years, occasionally mistaking them for cannonballs or man-made objects. Geologists have a name for them: concretions. And far from being modern oddities, these rocks are windows into a time, roughly 360 million years ago, when the land we now call Ohio sat beneath a warm, teeming prehistoric ocean long before the age of dinosaurs, let alone the age of people.
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