"A group of dome shaped features in lower Carboniferous (Mississippian) limestones in northwest Lancashire, England are described. Radial jointing is crudely developed and many of the features are characterised by a central crater. No such features have been previously described; they are interpreted as non-diastrophic structures developed by the expulsion of water from an underlying source. The descriptive term "spring-dome" is suggested for the structures."

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