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Perhaps no other rocks found in Ohio generate as much public interest and curiosity as the large carbonate spheres, known as concretions that weather out of the Devonian-age Ohio shale. Spherical concretions are confined to the Huron River in Huron and Erie Counties and only three other creeks in the State of Ohio. The lower part of the Huron contains the large, spherical concretions, which have been referred to as “Huron boulders.” | Huron

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Huron.jpg - Perhaps no other rocks found in Ohio generate as much public interest and curiosity as the large carbonate spheres, known as concretions that weather out of the Devonian-age Ohio shale. Spherical concretions are confined to the Huron River in Huron and Erie Counties and only three other creeks in the State of Ohio. The lower part of the Huron contains the large, spherical concretions, which have been referred to as “Huron boulders.”

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