A Septarian nodule (Fossilized mud bubble).
County Clare, Ireland.

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A partially revealed Septarian nodule.
County Clare, Ireland.

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A Septarian nodule - a fossilized mud bubble that has eroded out of the shale layers at the Cliffs of Moher.
County Clare, Ireland.

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Two sides of the same Septarian nodule. A fossilized mud bubble.
County Clare, Ireland.

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A fossilized mud bubble!! Formed in the mud layers of the massive delta that covered this area over 300 million years ago.
County Clare, Ireland.

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Cracks forming a cryptic pattern in this fossilized mud bubble.
A Sea polished Concretion from the Cliffs of Moher, County Clare, Ireland.

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