A dogger is a concretion, a mass of sedimentary rock that has been cemented more than the surrounding rock. These often weather out of their original rock, the most spectacular examples in the UK are those in Laig Bay on the Isle of Eigg (shown above). The Moeraki Boulders on the South Island of New Zealand are another example of this feature.
The name was also used as a term, though now superseded, for the Middle Jurassic.
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